[webapi][TC-1813] Add 1 P1 test for Locale API

Impacted tests(approved): new 1, update 0, delete 0
Unit test platform: [IVI]
Unit test summary: pass 1, fail 0, block 0
Merge pull request #1356 from kangxu/kangxu/webapi-locale-tizen-tests/update

[webapi] [TC-1813]Add 1 P1 test for Locale API