Update de.po

"Behörde" wurde zu "Institution" wenn es sich nicht um administrative Einrichtungen handelt.

"Antrag" wurde zu "Anfrage" oder "Registrierung", weil webtrees keine Behörde ist (einen Antrag stellt man in Deutschland nur bei Behörden, alles andere sind Anfragen).
Reviewed translations strings A-B
Reviewed translation strings C-E
Merge branch 'master' into patch-2

Conflicts:
	language/de.po
Merge branch 'master' into tikita_patch-1

Conflicts:
	language/de.po
Merge branch 'master' into patch-2
Merge branch 'tikita_patch-1' into patch-2

Conflicts:
	language/de.po
Reviewed translation strings F-H
Reviewed translation strings I-K
Reviewed translation strings L-M
Merge branch 'master' into patch-2
Various replacements

Antrag -> Anfrage
user account -> Benutzerkonto
\" -> “ and ”
\\ deleted
Reviewed translation strings N-O
Reviewed translation strings P-Sh
Reviewed translation strings Sh - line 13500
Various replacements

Thumbnail -> Vorschaubild
my page -> mein webtrees
Reviewed translation strings line 13500 - 14500
Various replacements

"Medien Objekt" -> Medienobjekt
Web-Seite -> Webseite
Admin pages titles
Cannot calculate days in month for dates with no year