Localeapp roundtrip + fixes

This includes an overdue synchronization of plugin locales. To make
translation easier for non-developers, we keep the strings at localeapp,
which puts everything in one file. All plugins enabled by default are
therefore included in Foodsoft's locales.

plugins/messages/config/locales/de.yml

@@ -74,7 +74,7 @@ de:
     groupmessage_threads:
       show_message_threads: Alle Nachrichtenverläufe anzeigen
     index:
-      other: Allgemeine Nachrichten
+      general: Allgemeine Nachrichten
       title: Nachrichtenverläufe
     message_threads:
       last_reply_at: Letze Antwort am
@@ -82,7 +82,7 @@ de:
       started_at: Gestartet am
       started_by: Gestartet von
     show:
-      other: Allgemeine Nachrichten
+      general: Allgemeine Nachrichten
   navigation:
     admin:
       messagegroups: Nachrichtengruppen

plugins/messages/config/locales/en.yml

@@ -133,7 +133,7 @@ en:
     groupmessage_threads:
       show_message_threads: show all
     index:
-      other: General
+      general: General
       title: Message threads
     message_threads:
       last_reply_at: Last replied at
@@ -141,7 +141,7 @@ en:
       started_at: Started at
       started_by: Started by
     show:
-      other: General
+      general: General
   messages_mailer:
     foodsoft_message:
       footer: ! 'Reply: %{reply_url}