From OpenSCADAWiki
Individual messages (the container-table "Trs")
But not all messages in OpenSCADA are related to its objects, for example — procedures on the internal language may contain text messages that should be translated separately, and not the whole procedure, which leads to its logical differences in different languages. Therefore, the function tr() has been implemented in the internal procedure language, which returns the translation of the message covered by it according to the MAIN language, or the language of the dynamic context in the MULTILANGUAGE-DYNAMIC mode and if the procedure is related to this context.