Allow language override from View menu

This has been asked for a couple of times now. I don't get it, but
people want to change the language of chirp, separate from their OS.
It just adds clutter to the UI, IMHO, but it must be important for
some reason.

Fixes #11349

chirp/wxui/main.py

@@ -802,6 +802,11 @@ def make_menubar(self):
         self.Bind(wx.EVT_MENU, self._menu_restore_tabs, restore_tabs)
         restore_tabs.Check(CONF.get_bool('restore_tabs', 'prefs', False))
 
+        lang_item = wx.MenuItem(view_menu, wx.NewId(),
+                                _('Language') + '...')
+        self.Bind(wx.EVT_MENU, self._menu_language, lang_item)
+        view_menu.Append(lang_item)
+
         radio_menu = wx.Menu()
 
         if sys.platform == 'darwin':
@@ -1438,6 +1443,51 @@ def _menu_restore_tabs(self, event):
         menuitem = event.GetEventObject().FindItemById(event.GetId())
         CONF.set_bool('restore_tabs', menuitem.IsChecked(), 'prefs')
 
+    @common.error_proof()
+    def _menu_language(self, event):
+        def fmt_lang(lang):
+            return '%s - %s' % (lang.DescriptionNative,
+                                lang.Description.split(' ')[0])
+
+        trans = wx.Translations.Get()
+        langs = {fmt_lang(wx.Locale.FindLanguageInfo(code)): code
+                 for code in trans.GetAvailableTranslations('CHIRP')}
+        # This is stupid, but wx.GetSingleChoice does not honor the width
+        # parameter. But, we can pad out the automatic sepection to get some
+        # extra padding in the dialog since we don't otherwise index it.
+        choices = ([_('Automatic from system') + ' ' * 30] +
+                   sorted(langs.keys()))
+        try:
+            current = wx.Locale.FindLanguageInfo(
+                CONF.get('force_language', 'prefs'))
+            initial = choices.index(fmt_lang(current.DescriptionNative))
+        except TypeError:
+            # Unset in the config (i.e. None)
+            initial = 0
+        except IndexError:
+            LOG.debug('Unable to find current language selection; '
+                      'defaulting to auto')
+            initial = 0
+
+        choice = wx.GetSingleChoice(_('Select Language'), _('Language'),
+                                    choices, parent=self,
+                                    initialSelection=initial)
+        if not choice:
+            return
+
+        try:
+            LOG.debug('User chose override language %r (%r)',
+                      choice, langs[choice])
+            CONF.set('force_language', langs[choice], 'prefs')
+        except KeyError:
+            LOG.debug('User chose automatic language')
+            CONF.remove_option('force_language', 'prefs')
+
+        if initial != choices.index(choice):
+            wx.MessageBox(_('CHIRP must be restarted for the new selection '
+                            'to take effect'),
+                          _('Restart Required'))
+
     def _make_backup(self, radio):
         if not isinstance(radio, chirp_common.CloneModeRadio):
             LOG.debug('Not backing up %s' % radio)