From In-Portal User Manual

'Import a regional pack' button (globe icon with a yellow arrow pointing down) allows the administrator to install a new pack, or update an existing one. Each pack can be downloaded and stored as a file. The format of the file is XML, and the name of the language pertaining to the pack is built into the file. Therefore, it is not necessary to select a pack when performing an import � its name will be automatically determined from the pack file. When importing a pack file, the administrator will need to upload it from the local computer by using the Browse button. Then the administrator should choose what types of phrases should be imported � �Front-end', �Administrator', or �Both'. In this case, �Both' does not mean �Front-end' and �Administrator', but it means the phrases of the type �Both' (which are used on the front-end and in the administrative console). The option �Overwrite Existing Phrases' will cause a replacement of all current phrases which are also found in the pack file being imported. It will not delete the language phrases, which are not found in the file. It is recommended to uncheck this option, to preserve any customized language values you may have. At the end of the import, a page with the result will be displayed. If a language import fails, this is usually due to the fact that there are not sufficient directory privileges on the �in-portal' directory, and the platform cannot upload the file for temporary use.