file conversion path logic broken in (at least) German language GUI

[uligrepel]

Setting the language to German basically breaks the file conversion path logic, it seems like the special placeholders such as <Folder:n> or <Filename> have been translated as well (but then they need to be documented - rather leave them in English, or at least understand English and the current GUI language)

[Lowlander]

When switching language the Masks are translated as well. When using multiple languages you run the risk that a Mask means one thing in one language and another thing in another language.