We currently have some level of search docs on localization support, describing how our native assets do or do not support localized search. There's a new standard for localization of assets arising out the Synonyms feature being developed for SP-1, and it requires a clear understanding of which assets fully support multi-language search, meaning that they have their full-text fields (e.g., title, content) indexed for each locale that the site supports.
We must enhance the existing docs to
1. Update to include the assets supporting any level of localized search, because it appears that more assets than currently documented have some level of localization support in their indexing code.
2. Explicitly call out which assets support multi-langauge search to the degree that they can successfully be used with Synonyms.