updated german locale: added new message
Revert "put current locale in consideration for various caches in filters/services"

This reverts commit 37bb69a409e2ed721def80c69e7727572bfdc17d.

Since we moved i18n into the init phase in
f1db5e1c962e458cc5da787cf8c248ebe23294f8 and don't switch locale at
runtime we don't need this anymore
updated i18n guide

reflect changes of f1db5e1c962e458cc5da787cf8c248ebe23294f8
added alias 'de' for 'de-de'
fix loading of angular-locale in init.js

1. check for locale == defaultLocale for locale from ConfigStorage
2. the <script> needs to be added to the doom before setting the src
   attribute
Merge pull request #474 from acran/master

Some minor fixes/updates to i18n