Translation GER 100% + Cleaning translation-words.txt

de_DE Translation is now about 100% for what gather-messages.sh has collected (Still some outstanding without <code>T_</code> function). Nearly all had to be replaced because of mixed formal and personal speaking, false grammar and inaccurate translation.

<code>/locale/base/messages.pot</code> updated.
<code>/locale/base/translation-words.txt</code> entry
<code>"- msgid "Interface"</code>
deleted because of double defined.