Catalog templates: Language-specific names and descriptions
Libraries in the catalog are created by individuals in their own native language. A speaker of language X won't usually bother to download a library with a name and description in language Y.
Create a database for each contributed template where the name and description can be added in any language from the default list. So someone's russian template can get info in French, English, Japanese, etc.
This will vastly increase the audience for every template available and encourage more people to download and upload templates, and to use Memento in general.
To prevent abuse, allow multiple names and descriptions, contributed by different people. Add a check that allows people to flag invalid contributions. Don't allow people to see how many times text has been flagged. With some number of flagged contributions, and entry will be removed and put into a review pool, or maybe just deleted. Email addresses associated with some number of deleted contributions will no longer be able to contribute.
Frankly, I can see a Memento database being used to coordinate all of this ... very elegant.