appwiz: Correct Wine Mono installer messages

[Ken Sharp]

When Mono was added quite a while ago the .po files became a little 
munged. Some have already been corrected but others give misleading 
messages about Wine Gecko.

Where the correction is obvious I have done so, but where a full 
translation is needed I have simply removed the incorrect one. This will 
mark that line as untranslated and hopefully someone will see that. It 
will also default to English with the correct message until translated.

A couple of typos fixed too.
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