Clean up MozL10n API use in Cost Control #1057795

    Added MockCommon in balance_view_test.js

    Clean up MozL10n API use in Cost Control #1057795

    Correcting errors for previous commit

    Removing errors

    Removing additional errors

    Minor changes

    Changes

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    Changes

    Changes

    Making Linter Changes

    rebaseing some changes

    Changes

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    Linter update

Minor change