The contents of the UI tab were saved as inline HTML in the UI file for TsMuxerWindow. Making them translatable would've exported the content to .ts files, which means that translators would have to put up with not only HTML, but HTML with XML escaping applied into it.
Moving the content to an external file seems like a best approach in this case. The content of the file is loaded in the appropriate language when switching languages. The HTML files themselves are included as resources at build time.
ce05c5d4d1