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If a XOOPS site is run in a language other than english and the admit adds a new module, xoops_load_lang_file() spills out an error message, if the language files for the local languate can't be found.
Suggestion: Make xoops_load_lang_file() revert to the english files, if the local ones can't be found.
This allows the admin to run modules, for which there is no local language support (or gives him/her some time to translate the files)