Part of bp make-string-localizable
usage: tox -e i18n
tools/check_i18n.py: used check i18n message for one file.
tools/check_i18n_test_case.txt: test case of check_i18n.py.
run test case with cmd:
$ ./tools/check_i18n.py ./tools/check_i18n_test_case.txt -d
Change-Id: I2c383b7bb11ab3bdb8e3bb3b887342b1225840ac