You're not going to find anything like that. Not only do different distros use different packaging systems and naming conventions, but language support itself is not as simple as applying a single package, because there are too many variables involved.
The biggest factors are your underlying locale settings and the language settings of your desktop environment. Your locale must first be set up with an encoding that supports that language. In most cases you'll use a UTF-8 encoding to ensure multi-language support.
After that it depends on whether you're using kde, gnome, or some other desktop. kde has a series of "l10n" and "i18n" packages, which stand for "localization" and "internationalization" respectively. The l10n packages allow you to change the interface to that language (menus, help dialogs, etc), and the i18n packages give you multiple language support within a single localization.
I'm not exactly sure how gnome or the other desktops supply multi-language support.
Finally, there are things like input method support, which will vary depending on the language you want to use. Japanese input is much more complex than Spanish, for example.