Add definition for Tamahaq, Tamashek and Tawallamat languages

[RosaWagner]

Link to #64
We have a sample text for Tifinagh, but Akatab only supports a subset of it. We can't push to prod until these subsets are defined.

cc @jvgaultney and @devosb

[jcoblentz]

Here is suggested text (screenshot and text file) that works for Akatab. Currently Akatab only supports taq, thv and ttq languages.

UDHR taq (Tamasheq) article1.txt

[RosaWagner]

@simoncozens instead of defining 3 languages, shall we simply add this sample text in Akatab's metadata.pb?

[simoncozens]

Sounds reasonable for now, at least until we have more linguistic information.