Prepare project to use Zanata for translations

.tx/config

@@ -0,0 +1,10 @@
+[main]
+host = https://www.transifex.com
+
+[cdda-game-launcher-project.cddagl-pot]
+file_filter = cddagl/locale/<lang>/LC_MESSAGES/cddagl.po
+minimum_perc = 0
+source_file = cddagl/locale/cddagl.pot
+source_lang = en
+type = PO
+

CONTRIBUTING.md

@@ -22,6 +22,17 @@ requests](#pull-requests), but please respect the following restrictions:
   respect the opinions of others.
 
 
+<a name="translations"></a>
+## Translations
+
+CDDA Game Launcher translations are hosted in Transifex. Transifex is a service
+with a straightforward web interface to let contributors help with untranslated text.
+
+Anyone is welcome to create or improve translations directly from
+[our project's page in Transifex](https://www.transifex.com/cdda-game-launcher/cdda-game-launcher-project/)
+after a simple registration process.
+
+
 <a name="bugs"></a>
 ## Bug reports
 

README.md

@@ -34,6 +34,7 @@ Anyone and everyone is welcome to contribute. Please take a moment to review the
 * [Bug reports](CONTRIBUTING.md#bugs)
 * [Feature requests](CONTRIBUTING.md#features)
 * [Pull requests](CONTRIBUTING.md#pull-requests)
+* [Translation contributions](CONTRIBUTING.md#translations)
 
 ## Code of conduct
 

cddagl/functions.py

@@ -72,9 +72,9 @@ def sizeof_fmt(num, suffix=None):
     for unit in ['', _('Ki'), _('Mi'), _('Gi'), _('Ti'), _('Pi'), _('Ei'),
         _('Zi')]:
         if abs(num) < 1024.0:
-            return _("%3.1f %s%s") % (num, unit, suffix)
+            return "%3.1f %s%s" % (num, unit, suffix)
         num /= 1024.0
-    return _("%.1f %s%s") % (num, _('Yi'), suffix)
+    return "%.1f %s%s" % (num, _('Yi'), suffix)
 
 def delete_path(path):
     ''' Move directory or file in the recycle bin (or permanently delete it

cddagl/i18n.py

@@ -34,15 +34,14 @@ def proxy_ngettext(*args, **kwargs):
 
 def get_available_locales(locale_dir):
     """Return a list of available locales in the specified directory."""
-    available_locales = []
+    available_locales = {'en'}
     if os.path.isdir(locale_dir):
         entries = os.scandir(locale_dir)
         for entry in entries:
             if entry.is_dir():
-                available_locales.append(entry.name)
+                available_locales.add(entry.name)
 
-    available_locales.sort(key=lambda x: 0 if x == 'en' else 1)
-    return available_locales
+    return sorted(available_locales, key=lambda x: 0 if x == 'en' else 1)
 
 
 def load_gettext_no_locale():
@@ -57,6 +56,9 @@ def load_gettext_locale(locale_dir, locale, domain='cddagl'):
 
     Fallback to default untranslated strings if locale file is not found.
     """
+    if locale == 'en':
+        return load_gettext_no_locale()
+
     try:
         translation = gettext.translation(domain, localedir=locale_dir, languages=[locale])
     except FileNotFoundError as err: