Improve timestripper to support more languages

-Fixed regex of month digit from \d{1,2} to (?:1[012]|0?[1-9])
-Added sign of day, month and year for Korean
-Added a fixer to make non_latin_digits lation (languages like fa and ckb)

I tested it on three languages that are working now: ko, fa and ckb.

Change-Id: Iddbccc7cbcf16e77ca334d9a0d434f9e084884eb
Merge "Improve timestripper to support more languages"