diff -Nru veusz-1.26.1/ChangeLog veusz-1.27/ChangeLog
--- veusz-1.26.1/ChangeLog	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/ChangeLog	2017-09-02 17:31:54.000000000 +0000
@@ -1,11 +1,13 @@
-Changes in <next version>:
+Changes in 1.27:
  * New FITS import code and user interface, allowing much more
    flexible and convenient FITS importing
  * Fix half pixel error in linear WCS FITS support
  * Save custom definitions after importing data, to allow customs
    to depend on datasets.
+ * Add preference for loading translation file
  * Fix logical errors in transparency in image widget
- * Fix for Python 3 unable to generally sort (name, instance)
+ * If cannot find translation or plugin, do not end app after showing error
+ * Fix for Python 3 for reloading datasets
 
 Changes in 1.26.1:
  * Change homepage in program to new site https://veusz.github.io/
diff -Nru veusz-1.26.1/debian/bzr-builder.manifest veusz-1.27/debian/bzr-builder.manifest
--- veusz-1.26.1/debian/bzr-builder.manifest	2017-09-01 17:39:57.000000000 +0000
+++ veusz-1.27/debian/bzr-builder.manifest	2017-09-02 17:31:56.000000000 +0000
@@ -1,3 +1,3 @@
-# bzr-builder format 0.3 deb-version {debupstream}-0~2288~201709011739
-lp:veusz revid:git-v1:3d484239c000c7dc3c4516eca87cd44c78bf79a3
-nest-part packaging lp:~jeremysanders/veusz/deb-packaging debian debian revid:jeremy@jeremysanders.net-20170517182847-i0vo8x4s2wyrfhfj
+# bzr-builder format 0.3 deb-version {debupstream}-0~2291~201709021731
+lp:veusz revid:git-v1:7dd0f6a63d56692f9f94ad7b6203df1375d44d91
+nest-part packaging lp:~jeremysanders/veusz/deb-packaging debian debian revid:jeremy@jeremysanders.net-20170902151128-z2g8h28u6v405ebt
diff -Nru veusz-1.26.1/debian/changelog veusz-1.27/debian/changelog
--- veusz-1.26.1/debian/changelog	2017-09-01 17:39:57.000000000 +0000
+++ veusz-1.27/debian/changelog	2017-09-02 17:31:56.000000000 +0000
@@ -1,8 +1,14 @@
-veusz (1.26.1-0~2288~201709011739~ubuntu14.04.1) trusty; urgency=low
+veusz (1.27-0~2291~201709021731~ubuntu14.04.1) trusty; urgency=low
 
   * Auto build.
 
- -- Jeremy Sanders <jeremy@jeremysanders.net>  Fri, 01 Sep 2017 17:39:57 +0000
+ -- Jeremy Sanders <jeremy@jeremysanders.net>  Sat, 02 Sep 2017 17:31:56 +0000
+
+veusz (1.27-0) UNRELEASED; urgency=low
+
+  * Update to Veusz 1.27
+
+ -- Jeremy Sanders <jeremy@jeremysanders.net>  Sat, 02 Sep 2017 17:10:00 +0200
 
 veusz (1.26.1-0) UNRELEASED; urgency=low
 
diff -Nru veusz-1.26.1/INSTALL veusz-1.27/INSTALL
--- veusz-1.26.1/INSTALL	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/INSTALL	2017-09-02 17:31:54.000000000 +0000
@@ -37,7 +37,7 @@
 
 To install on linux to the standard location on the hard disk
 
-# cd veusz-1.26.1
+# cd veusz-1.27
 # python setup.py build
 # su
 [enter root password]
@@ -95,8 +95,8 @@
 If you don't want to install veusz fully or are doing development, it
 can currently be run from its own directory. Do
 
-# tar xzf veusz-1.26.1.tar.gz                [change version here]
-# cd veusz-1.26.1
+# tar xzf veusz-1.27.tar.gz                [change version here]
+# cd veusz-1.27
 # ./run_veusz_inplace
 
 Certain features will be disabled if you do this. You will not be able
@@ -118,8 +118,8 @@
 incompatibilities. Simply unpack the tar file and run the main
 executable:
 
-# tar xzf veusz-linux-i386-1.26.1.tar.gz     [change version here]
-# cd veusz-linux-i386-1.26.1
+# tar xzf veusz-linux-i386-1.27.tar.gz     [change version here]
+# cd veusz-linux-i386-1.27
 # ./veusz
 
 2.2 Installing in Windows
diff -Nru veusz-1.26.1/README veusz-1.27/README
--- veusz-1.26.1/README	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/README	2017-09-02 17:31:54.000000000 +0000
@@ -1,5 +1,5 @@
-Veusz 1.26.1
-------------
+Veusz 1.27
+----------
 https://veusz.github.io
 
 Veusz is a scientific plotting package.  It is designed to produce
@@ -12,22 +12,20 @@
 manipulation and editing of datasets. Data can be captured from
 external sources such as Internet sockets or other programs.
 
-Changes in 1.26.1:
- * Change homepage in program to new site https://veusz.github.io/
- * Change new version checking to use veusz.github.io
+                              ** NOTE **
+        This is intended to be the final Qt4 release of Veusz.
+ Future releases will be Qt5 only, except in the case of major bugs.
 
-Changes in 1.26:
- * Add color themes and automatic coloring of widgets
- * Custom color definitions
- * Improved custom definition dialog box
- * Fix loading translator via command line
- * Show horizontal error lines/fills in key
- * Use iMinuit if available for fitting
- * Fix for dataset plugins returning nD datasets
- * Add editable automatic axis range, including support for shrinking
-   range (-X%), percentage ranges (X-Y%) and limits (<X% and >Y%)
- * Fix for key if invalid dataset
- * For log scaling on image widget, show invalid values as being transparent
+Changes in 1.27:
+ * New FITS import code and user interface, allowing much more
+   flexible and convenient FITS importing
+ * Fix half pixel error in linear WCS FITS support
+ * Save custom definitions after importing data, to allow customs
+   to depend on datasets.
+ * Add preference for loading translation file
+ * Fix logical errors in transparency in image widget
+ * If cannot find translation or plugin, do not end app after showing error
+ * Fix for Python 3 for reloading datasets
 
 Features of package:
  Plotting features:
diff -Nru veusz-1.26.1/ui/preferences.ui veusz-1.27/ui/preferences.ui
--- veusz-1.26.1/ui/preferences.ui	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/ui/preferences.ui	2017-09-02 17:31:54.000000000 +0000
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>660</width>
-    <height>281</height>
+    <height>341</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -23,99 +23,120 @@
       <attribute name="title">
        <string>View</string>
       </attribute>
-      <layout class="QVBoxLayout" name="verticalLayout">
-       <item>
-        <layout class="QGridLayout" name="gridLayout_3">
-         <item row="0" column="0" colspan="2">
-          <widget class="QCheckBox" name="antialiasCheck">
-           <property name="toolTip">
-            <string>Use antialiasing to smooth jagged edges</string>
-           </property>
-           <property name="text">
-            <string>Antialiasing</string>
-           </property>
-          </widget>
-         </item>
-         <item row="1" column="0" colspan="2">
-          <widget class="QCheckBox" name="englishCheck">
-           <property name="toolTip">
-            <string>Please restart Veusz after changing this option</string>
-           </property>
-           <property name="text">
-            <string>Override system locale settings to show Veusz in US/English</string>
-           </property>
-          </widget>
-         </item>
-         <item row="2" column="0">
-          <widget class="QLabel" name="label_5">
-           <property name="text">
-            <string>Update interval</string>
-           </property>
-          </widget>
-         </item>
-         <item row="2" column="1">
-          <widget class="QComboBox" name="intervalCombo">
+      <layout class="QGridLayout" name="gridLayout_2">
+       <item row="0" column="0">
+        <widget class="QCheckBox" name="antialiasCheck">
+         <property name="toolTip">
+          <string>Use antialiasing to smooth jagged edges</string>
+         </property>
+         <property name="text">
+          <string>Antialiasing</string>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="0" colspan="2">
+        <widget class="QCheckBox" name="englishCheck">
+         <property name="toolTip">
+          <string>Please restart Veusz after changing this option</string>
+         </property>
+         <property name="text">
+          <string>Override system locale settings to show Veusz in US/English</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="0">
+        <widget class="QLabel" name="label_5">
+         <property name="text">
+          <string>Update interval</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="1">
+        <widget class="QComboBox" name="intervalCombo">
+         <property name="toolTip">
+          <string>How often Veusz will update the plot if it has changed</string>
+         </property>
+        </widget>
+       </item>
+       <item row="3" column="0">
+        <widget class="QLabel" name="label_6">
+         <property name="text">
+          <string>Toolbar icon size</string>
+         </property>
+        </widget>
+       </item>
+       <item row="3" column="1">
+        <widget class="QComboBox" name="iconSizeCombo">
+         <item>
+          <property name="text">
+           <string>8</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>16</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>24</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>32</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>48</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>64</string>
+          </property>
+         </item>
+        </widget>
+       </item>
+       <item row="4" column="0">
+        <widget class="QLabel" name="label_11">
+         <property name="text">
+          <string>Number of drawing threads</string>
+         </property>
+        </widget>
+       </item>
+       <item row="4" column="1">
+        <widget class="QSpinBox" name="threadSpinBox">
+         <property name="toolTip">
+          <string>Maximum number of parallel threads to use for drawing plots.
+Set to 0 to disable threads.</string>
+         </property>
+         <property name="maximum">
+          <number>16</number>
+         </property>
+        </widget>
+       </item>
+       <item row="5" column="0">
+        <widget class="QLabel" name="label_2">
+         <property name="text">
+          <string>Translation</string>
+         </property>
+        </widget>
+       </item>
+       <item row="5" column="1">
+        <layout class="QHBoxLayout" name="horizontalLayout_4">
+         <item>
+          <widget class="QLineEdit" name="translationEdit">
            <property name="toolTip">
-            <string>How often Veusz will update the plot if it has changed</string>
+            <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Load an externally-provided translation file on startup&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
            </property>
           </widget>
          </item>
-         <item row="3" column="0">
-          <widget class="QLabel" name="label_6">
-           <property name="text">
-            <string>Toolbar icon size</string>
-           </property>
-          </widget>
-         </item>
-         <item row="3" column="1">
-          <widget class="QComboBox" name="iconSizeCombo">
-           <item>
-            <property name="text">
-             <string>8</string>
-            </property>
-           </item>
-           <item>
-            <property name="text">
-             <string>16</string>
-            </property>
-           </item>
-           <item>
-            <property name="text">
-             <string>24</string>
-            </property>
-           </item>
-           <item>
-            <property name="text">
-             <string>32</string>
-            </property>
-           </item>
-           <item>
-            <property name="text">
-             <string>48</string>
-            </property>
-           </item>
-           <item>
-            <property name="text">
-             <string>64</string>
-            </property>
-           </item>
-          </widget>
-         </item>
-         <item row="4" column="0">
-          <widget class="QLabel" name="label_11">
+         <item>
+          <widget class="QPushButton" name="translationBrowseButton">
            <property name="text">
-            <string>Number of drawing threads</string>
-           </property>
-          </widget>
-         </item>
-         <item row="4" column="1">
-          <widget class="QSpinBox" name="threadSpinBox">
-           <property name="toolTip">
-            <string>Maximum number of parallel threads to use for drawing plots.
-Set to 0 to disable threads.</string>
-           </property>
-           <property name="maximum">
-            <number>16</number>
+            <string>Browse...</string>
            </property>
           </widget>
          </item>
diff -Nru veusz-1.26.1/VERSION veusz-1.27/VERSION
--- veusz-1.26.1/VERSION	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/VERSION	2017-09-02 17:31:54.000000000 +0000
@@ -1 +1 @@
-1.26.1
+1.27
diff -Nru veusz-1.26.1/veusz/dialogs/preferences.py veusz-1.27/veusz/dialogs/preferences.py
--- veusz-1.26.1/veusz/dialogs/preferences.py	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/veusz/dialogs/preferences.py	2017-09-02 17:31:54.000000000 +0000
@@ -62,6 +62,9 @@
             setdb['plot_updatepolicy'])
         self.intervalCombo.setCurrentIndex(index)
         self.threadSpinBox.setValue( setdb['plot_numthreads'] )
+        self.translationEdit.setText( setdb['translation_file'] )
+        self.translationBrowseButton.clicked.connect(
+            self.translationBrowseClicked)
 
         # disable thread option if not supported
         if not qt4.QFontDatabase.supportsThreadedFontRendering():
@@ -183,6 +186,7 @@
         setdb['plot_antialias'] = self.antialiasCheck.isChecked()
         setdb['ui_english'] = self.englishCheck.isChecked()
         setdb['plot_numthreads'] = self.threadSpinBox.value()
+        setdb['translation_file'] = self.translationEdit.text()
 
         # use cwd
         setdb['dirname_usecwd'] = self.dirDocCWDRadio.isChecked()
@@ -232,6 +236,13 @@
         # write settings out now, rather than wait until the end
         setdb.writeSettings()
 
+    def translationBrowseClicked(self):
+        """Browse for a translation."""
+        filename = self.parent().fileOpenDialog(
+            [_('Translation file (*.qm)')], _('Choose translation file'))
+        if filename:
+            self.translationEdit.setText(filename)
+
     def styleBrowseClicked(self):
         """Browse for a stylesheet."""
         filename = self.parent().fileOpenDialog(
diff -Nru veusz-1.26.1/veusz/document/doc.py veusz-1.27/veusz/document/doc.py
--- veusz-1.26.1/veusz/document/doc.py	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/veusz/document/doc.py	2017-09-02 17:31:54.000000000 +0000
@@ -367,7 +367,7 @@
             except Exception:
                 err = _('Error loading plugin %s\n\n%s') % (
                     plugin, traceback.format_exc())
-                qt4.QMessageBox.critical(None, _("Error loading plugin"), err)
+                raise RuntimeError(err)
 
     def paintTo(self, painthelper, page):
         """Paint page specified to the paint helper."""
diff -Nru veusz-1.26.1/veusz/helpers/src/qtloops/qtloops.cpp veusz-1.27/veusz/helpers/src/qtloops/qtloops.cpp
--- veusz-1.26.1/veusz/helpers/src/qtloops/qtloops.cpp	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/veusz/helpers/src/qtloops/qtloops.cpp	2017-09-02 17:31:54.000000000 +0000
@@ -408,7 +408,7 @@
     }
 
 
-  if(not hasalpha)
+  if(!hasalpha)
     {
       // return image without transparency for speed / space improvements
 #if QT_VERSION >= QT_VERSION_CHECK(5, 9, 0)
diff -Nru veusz-1.26.1/veusz/setting/settingdb.py veusz-1.27/veusz/setting/settingdb.py
--- veusz-1.26.1/veusz/setting/settingdb.py	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/veusz/setting/settingdb.py	2017-09-02 17:31:54.000000000 +0000
@@ -83,6 +83,9 @@
 
     # add these directories to the python path (colon-separated)
     'external_pythonpath': '',
+
+    # translation file to load
+    'translation_file': '',
     }
 
 class _SettingDB(object):
diff -Nru veusz-1.26.1/veusz/veusz_main.py veusz-1.27/veusz/veusz_main.py
--- veusz-1.26.1/veusz/veusz_main.py	2017-09-01 17:39:53.000000000 +0000
+++ veusz-1.27/veusz/veusz_main.py	2017-09-02 17:31:54.000000000 +0000
@@ -34,7 +34,7 @@
         os.path.abspath(os.path.join(os.path.dirname(__file__), '..')) )
     import veusz
 
-from veusz.compat import czip, cbytes
+from veusz.compat import czip, cbytes, cstr
 from veusz import qtall as qt4
 from veusz import utils
 
@@ -234,12 +234,6 @@
             self.splash = makeSplashLogo()
             self.splash.show()
 
-        # optionally load a translation
-        if self.options.translation:
-            self.trans = qt4.QTranslator()
-            self.trans.load(self.options.translation)
-            self.installTranslator(self.trans)
-
         self.thread = ImportThread()
         self.thread.finished.connect(self.slotStartApplication)
         self.thread.start()
@@ -254,6 +248,9 @@
         vzdbus.setup()
         vzsamp.setup()
 
+        # add text if we want to display an error after startup
+        startuperrors = []
+
         from veusz import document
         from veusz import setting
 
@@ -264,13 +261,26 @@
         setting.transient_settings['unsafe_mode'] = bool(
             options.unsafe_mode)
 
+        # optionally load a translation
+        txfile = options.translation or setting.settingdb['translation_file']
+        if txfile:
+            self.trans = qt4.QTranslator()
+            if self.trans.load(txfile):
+                self.installTranslator(self.trans)
+            else:
+                startuperrors.append(
+                    'Error loading translation "%s"' % txfile)
+
         # add directories to path
         if setting.settingdb['external_pythonpath']:
             sys.path += setting.settingdb['external_pythonpath'].split(':')
 
         # load any requested plugins
         if options.plugin:
-            document.Document.loadPlugins(pluginlist=options.plugin)
+            try:
+                document.Document.loadPlugins(pluginlist=options.plugin)
+            except RuntimeError as e:
+                startuperrors.append(cstr(e))
 
         # different modes
         if options.listen:
@@ -289,6 +299,11 @@
         if self.splash is not None:
             self.splash.finish(self.topLevelWidgets()[0])
 
+        # this has to be displayed after the main window is created,
+        # otherwise it never gets shown
+        for error in startuperrors:
+            qt4.QMessageBox.critical(None, "Veusz", error)
+
 def run():
     '''Run the main application.'''