I guess we're just confused about what you actually want to
do with this information. If you just want somewhere you can look up the Russian translation for "Darnassus", that already exists, and it's called Wowhead.com. Find
the page for "Darnassus", then click on the language dropdown at the top of the page (it probably says "English" right now), and click on "Русский" to switch to the Russian version of the page.
There's just no use for this information in an addon, though, since there are locale-independent numeric identifiers for all zones and factions, and there's absolutely no reason to use a bloated database of string translations when you can use a single number instead.