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).
Merge pull request #146 from jon48/hotfix/proposal

Consistently use WT_ROOT in the require/require_once statements
Cleanup - unused code
Cleanup - unused code
Cleanup - unused code
Interactive tree - show all spouses option fails when chart is embedded in home page
Cleanup - parameters incompatible with declarations
Cleanup - unused code
Bogus arguments being passed to indi/fam lists
FILE fields should not have DATE subfields
Correct regression to Family Book block placement in Dec 15 patch
Pass objects, not XREFs
Parameter mismatch in reports
Cleanup - remove constructors that simply call their parents
Call \WT\Auth::user()->setSetting with wrong number of parameters
Merge pull request #147 from ddrury/indilist.php_bug_fix

Call \WT\Auth::user()->setSetting with wrong number of parameters
Calling User::setSetting() fails if called before User::getSetting()
Correct pedigree vertical line spacing when more than 5 generations
Error sending mail between users
Fix weird bug on windows php #148