Merge "Add Data warning and limit footer text." into pi-dev

    <!-- Label for button to set the amount of data before user is warned about usage [CHAR LIMIT=30] -->

    <string name="data_warning">Data warning</string>

    <!-- Label for footnote on Data warning and limit page to warn of device discrepancies -->

    <string name="data_warning_footnote">Data warning and data limit are measured by your device. This may be different from carrier data.</string>

    <!-- Label for switch about whether to limit how much data can be used [CHAR LIMIT=30] -->

    <string name="set_data_limit">Set data limit</string>

        mEnableDataLimit = (SwitchPreference) findPreference(KEY_SET_DATA_LIMIT);

        mEnableDataLimit.setOnPreferenceChangeListener(this);

        mDataLimit = findPreference(KEY_DATA_LIMIT);

        mFooterPreferenceMixin.createFooterPreference().setTitle(R.string.data_warning_footnote);

    }

    @Override