fix optimistic locking

last modfied stamp had only a resolution of seconds but internally time ist stored as milliseconds
move drop hint up to prevent overlaying content fix #32
add focus if anything in tags is clicked
minor style tweaks
add min width to tags
fix optimistic locking

timestamp of document was not updated on client
remove new lines and tags from title and tags
add language switcher, translation for de still missing
add german locale and fix some untranslated strings, fixes #32
make css hint translateable
add tags hint