more content and translation to forum.php
more content and translation to forum.php

this file was originally translated according to /lang/em/forum.php root file
all translations and dependencies are fully included in this file since the last change, commit: 625f425 
sorry for the mess on pull requests, i will try send the single commits in single pulls
comentarinformal/osu-web,LiquidPL/osu-web,ppy/osu-web,notbakaneko/osu-web,kj415j45/osu-web,LiquidPL/osu-web,ppy/osu-web,nekodex/osu-web,ppy/osu-web,notbakaneko/osu-web,nanaya/osu-web,notbakaneko/osu-web,LiquidPL/osu-web,marcostudios/osu-web,comentarinformal/osu-web,ppy/osu-web,Kuron-kun/osu-web,nekodex/osu-web,LiquidPL/osu-web,Nekonyx/osu-web,Nekonyx/osu-web,omkelderman/osu-web,omkelderman/osu-web,Kuron-kun/osu-web,kj415j45/osu-web,Kuron-kun/osu-web,omkelderman/osu-web,nanaya/osu-web,omkelderman/osu-web,comentarinformal/osu-web,nanaya/osu-web,comentarinformal/osu-web,marcostudios/osu-web,notbakaneko/osu-web,nekodex/osu-web,Kuron-kun/osu-web,LiquidPL/osu-web,nanaya/osu-web,kj415j45/osu-web,marcostudios/osu-web,nanaya/osu-web,ppy/osu-web,Nekonyx/osu-web,comentarinformal/osu-web,kj415j45/osu-web,marcostudios/osu-web,Nekonyx/osu-web,marcostudios/osu-web,nekodex/osu-web,notbakaneko/osu-web,nekodex/osu-web