I've read through several times the complete documentation of Languages. Based on the explanations in the "Setting a custom language environment variable" I've come to the conclusion, that the environment variable %PAL:LanguageCustom% exclusively will be applied in the PortableApps.com Platform. This environment variable is generated by the sections [Language] and [LanguageStrings].
On the other hand the section [LanguageFile] will only applied, if the portable program is started outside of PortableApps.com Platform. From this I deduced, that the section [LanguageFile] not uses the environment variable %PAL:LanguageCustom%. Instead the section [LanguageFile] uses a particular file.
Are these statements so far correct?