Context menu item was added by MBAM's shell extension (
C:\Program Files\Malwarebytes Anti-Malware\mbamext.dll).
This DLL contains hard-coded strings for every supported language and displays one according to default system language (because the shell extension is loaded inside of
You should ask the vendor to fix this shell extension, so that it will use language selected in MBAM's settings.
The other option is to edit the string directly in mbamext.dll using a hex-editor. Though I don't recommend that as it will break file's digital signature.