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Update translating instructions

pladask/flarum-ext-norwegian-nynorsk,FlarumChina/flarum-ext-simplified-chinese-pro,flarum/english,flarum/flarum-ext-english,gtugablue/flarum-ext-portuguese,FlarumChina/flarum-ext-simplified-chinese-pro,pladask/flarum-ext-norwegian-bokmal,ogioncz/flarum-ext-czech,raweba/flarum-ext-danish,ogioncz/flarum-ext-czech,pladask/flarum-ext-norwegian-bokmal,pladask/flarum-ext-norwegian-nynorsk,balkanje/flarum-ext-bosnian1