LatinIME: Add en_GB, en_US, lt, lv, ro, sl, sr, tr dictionaries

Missing dictionaries were built from wordlists (using dicttool) which are in LatinIME:
https://github.com/LineageOS/android_packages_inputmethods_LatinIME/blob/lineage-16.0/dictionaries/

Now both have the same amount of 32 languages.

Default dictionaries (de, en, es, fr, it, pt_br, ru) don't need to be added again, are included here:
https://github.com/LineageOS/android_packages_inputmethods_LatinIME/tree/lineage-16.0/java/res/raw

Change-Id: Iafe8441dc179b579c9c99338649045eeb7a7f675