LatinIME: Allow importing external dictionaries

The code is already present but hidden in LatinIME debug settings
Enable the feature and improve the dialog message a bit

The user simply needs to have a .dict dictionary (one or more) in
the /Download folder of his storage.

Change-Id: I93f4be4c41c02ba6306c6a29cf4d1178dd9837b3
LatinIME: LT translations

Change-Id: Icccaaab4385d0f3aab48fe016f38ac8ec93d708c
LatinIME: CS translation

- added CM specific Czech translation

Change-Id: I728e8c600e48599840fdf63b12c59ad425f2b79b
LatinIME: RU translation

Change-Id: I5f869160d987789dfbe00a2aac72647091f0c1d2
LatinIME: Update DE translation

Change-Id: I0832c8e0306a9a75aa27e0f6a3ded93b8046226c
LatinIME: EL translations

PS2: Trigger Cid

Change-Id: I244e695f73461abdeabc6f906f0763ec09ada950
LatinIME: DA translation

Cid trigger

Change-Id: Ib3992031adccb3c393980da9bf81b3d543617ac2
LatinIME: PT-BR Translations

PS2: Trigger Cid

Change-Id: I62b2e33b3cd828448aa6a5a798eee41319d6c800
Merge "LatinIME: RU translation" into cm-11.0
Merge "LatinIME: Update DE translation" into cm-11.0
Merge "LatinIME: DA translation" into cm-11.0
Merge "LatinIME: LT translations" into cm-11.0
Merge "LatinIME: EL translations" into cm-11.0
Merge "LatinIME: PT-BR Translations" into cm-11.0