Language update

line 54: inserting the missing plural-suffix
line 54: I'de suggest to use a German term for "Limit", we could use e.g. "Höchstgrenze" or "Grenze". What do you think about that?
line 58: stylistic change
line 70. Would you please check on this line? I'd consider this line as syntacticly not correct as the subject and verb seem to be missing.
Language changes

l. 33: changes due to style and tense
l. 56 + 57: another preposition was inserted
l. 67: another tense was inserted
l. 125: change due to style
Added support for quotes upon conversation creation
Merge branch 'master' of github.com:WoltLab/com.woltlab.wcf.conversation
Language fixes by @Gabbid
Updated English translation