Support languages other than the default on linux

Regarding the latest code on linux,
It was always setting by default language even if value of language was existed.
So we need to add routine for setting language via "spd_set_language".

BUG=289548

Review URL: https://codereview.chromium.org/1043933002

Cr-Commit-Position: refs/heads/master@{#326764}
3 files changed