Fix help strings for the global prefs object not being localized

src/calibre/utils/config_base.py

@@ -146,6 +146,12 @@ class OptionSet(object):
         self.preferences.append(pref)
         self.defaults[name] = default
 
+    def retranslate_help(self):
+        t = _
+        for opt in self.preferences:
+            if opt.help:
+                opt.help = t(opt.help)
+
     def option_parser(self, user_defaults=None, usage='', gui_mode=False):
         from calibre.utils.config import OptionParser
         parser = OptionParser(usage, gui_mode=gui_mode)
@@ -342,6 +348,9 @@ class ConfigProxy(object):
     def refresh(self):
         self.__opts = self.__config.parse()
 
+    def retranslate_help(self):
+        self.__config.option_set.retranslate_help()
+
     def __getitem__(self, key):
         return self.get(key)
 

src/calibre/utils/localization.py

@@ -137,6 +137,11 @@ def set_translators():
         t = NullTranslations()
 
     t.install(unicode=True, names=('ngettext',))
+    # Now that we have installed a translator, we have to retranslate the help
+    # for the global prefs object as it was instantiated in get_lang(), before
+    # the translator was installed.
+    from calibre.utils.config_base import prefs
+    prefs.retranslate_help()
 
 _iso639 = None
 _extra_lang_codes = {