A language project directory is a subfolder under the widget root directory that contains all the localized resources for a specific language.
A language project directory is named xx.lproj, where xx is the two-letter ISO 639-1 code that represents an international language and .lproj is a constant string standing for “language project”. For a list of ISO 639-1 language codes, see the Language code table in the Symbian OS Library.
Examples of language project directories:
en.lproj for English
fi.lproj for Finnish
zh_Hans.lproj for Simplified Chinese
zh_Hant.lproj for Traditional Chinese
All language project directories must be located as direct subfolders under the widget root directory.

Figure: Example directory structure