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I always wanted my characters to learn Azeroth's languages and that's why i started making up quests to learn the languages.
In the first place I only want to allow the Alliance/Horde the languages of theier faction. And a few languages available to both...
The quests in this Idea are separted into different groups, there are questlines that generally starts with level 35 that will give you the Artisan language rank around level 60, you will be able to read what people say, but there will be errors in the sentences, just like if you're drunk. Later on, with level 80, there will be another questline that will help you learn the language in a deeper aspect and your skill is going to increase, allowing you to read the sentences in a normal form.
Magtoor leader of the Broken Exiles starts the questline Lost in Travel, which tells the Draenei's story. It will eventually lead you to Draenor. Since the Draenei are an alien race and there is nothing, or very few, to learn about them on Azeroth, the initial questline will give you an "Apprentice"-skill, and you will be able to enhance it in Outland.