#10 Export data in only one language

[Frederic Bergeron]

When I export all my German and French glossaries, I discovered that parts of my Spanish glossaries are also exported because they contain French translations.

I think a better behavior would be:

If the Show All Glossaries option is enabled, use the current behavior, that is, warn that translations have been found in many languages and try to export as much data as possible, even partial glossaries with single language translations.

If the Show All Glossaries option is disabled, consider only translations that have both the selected languages.