Files that contain the .language file extension are normally used by the Skype online communication software application.
The LANGUAGE files that are used by the Skype software contain information that allows a user to change the language that is displayed on the user's Skype interface. A user can go into the "Tools" menu of the Skype software and can then select the "Change Language" option to edit the default language that the software interface displays.
For example, if a user's Skype interface is displaying text in English and the user is a native German speaker, he or she can change the interface to show the German language by selecting this option. The LANGUAGE file holding the German language data allows the user to perform this action.
Unfortunately we have not received enough suggestions for software that can open LANGUAGE files yet.
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If you have additional information about the LANGUAGE file format or software that uses files with the LANGUAGE suffix, please do get in touch - we would love hearing from you.