traditional Chinese localization, string extraction, icon clone and resize

1. add zh-tw for traditional Chinese Language
2. extract some hard-code string to resource file
3. clone rssi-icon to radio-icon and resize radio-icon to the same size with other menu-icon
@metalnow as noted by the comment above, instead of repeating the content of this file, extract the string item in these string arrays to the `strings.xml` file, and provide their translation in a matching localized `strings.xml` file.