Colons at the end of sentences

DELETE_POST_PERMANENTLY, DELETE_TOPIC_PERMANENTLY
see: https://www.phpbb.de/community/viewtopic.php?f=141&t=231393&start=10#p1329075
phpBB 3.1.1 to 3.1.2 change incl english part
CC_KOPIE --> CC_SENDER (Uebersetzung bleibt identisch)
Merge pull request #185 from gn36/typos/t1

Colons at the end of sentences
Änderungswünsche eingepflegt
Merge pull request #187 from Crizz0/phpBB3.1.2-gesamt

phpBB 3.1.1 to 3.1.2 change incl english part
Readme for phpBB 3.1.2
Jump to -> Gehe zu Forum
Merge pull request #189 from gn36/issues/184

Jump to -> Gehe zu Forum
Merge pull request #188 from Crizz0/readme3.1.2

Readme for phpBB 3.1.2