Update leihs.po

Translate some English words
update po files from pot
Merge branch 'master' of github.com:andre-su/leihs

Conflicts:
	locale/en_GB/leihs.po
Added lots more German to English translations. Correctly spelled Tuesday.
Copied translations from en_GB to en_US
sort case-insensitively
Merge branch 'master' of https://github.com/suqld/leihs into improve_translations