Remove redundant calls to prepareInputmethods
and redundant button styling.
Rename firstLanguauge to the clearer currentLanguage.
Switch checking for imeLanguage and the prereferences language
to make sure that the last one is shown.
Done in pair programming with Santhosh.
Bug: 48163
Change-Id: Ie8441f29eb20caa05534c8589481a26cb415a27f