when you localize resources from a plugin and then get newer plugin version/reinstall plugin/click "refresh plugin resources" button guess what happens? Your translated resources are replaced with english and your work is lost. Wouldn't it be better to keep translated resources untouched and just insert newly added strings?
By the way. Importing translated resources (XML file) works very weirdly. It only replaces "some" resources with translations - no, its not just omiting the "dbo.LocaleStringResource.IsTouched" column. It omits much more strings. Thousands. I had to write my own tool to import translated strings back.