Add German translation (#13)

* Added German translation
* Make French translation actually French
* Added 'de' to supported locales

assets/i18n/de.po

@@ -0,0 +1,21 @@
+# Philipp Kiemle <philipp.kiemle@gmail.com>, 2021.
+msgid ""
+msgstr ""
+"Project-Id-Version: \n"
+"POT-Creation-Date: 2021-09-29 09:59+0200\n"
+"PO-Revision-Date: 2021-11-11 09:09+0100\n"
+"Last-Translator: Philipp Kiemle <philipp.kiemle@gmail.com>\n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: Lokalize 21.08.2\n"
+"X-Poedit-Basepath: .\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"Language: de\n"
+
+msgid "Main menu"
+msgstr "Hauptmenü"
+
+msgid "Use dark mode"
+msgstr "Den dunklen Modus verwenden"

assets/i18n/fr.po

@@ -5,7 +5,7 @@ msgstr ""
 "PO-Revision-Date: 2021-09-29 10:58+0200\n"
 "Last-Translator: \n"
 "Language-Team: \n"
-"Language: en\n"
+"Language: fr\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"

lib/src/app.dart

@@ -49,6 +49,7 @@ class _AppState extends State<App> with PreferencesMixin {
                  * but are present in fr.po, the missing translations will not be picked up from fr.po,
                  * and thus will show up in english.
                  */
+                Locale('de'),
                 Locale('en'),
                 Locale('fr'),
                 Locale('fr', 'CH'),