Add Karma test runner congiguration

Add Karma configuration for running tests and inspecting code coverage.
Currently code coverage over %80.
Add Karma test runner congiguration

Add Karma configuration for running tests and inspecting code coverage.
Currently code coverage over %80.
Merge branch 'karma-config' into region-ignore
Ignore the region part of browser language

Ignore the region part of the browser's language to simplify localization
files and filenames.