Two new complete catalogs (2542 entries each, full coverage of the
uk.tsv key set): Indonesian (id) and Vietnamese (vi), both with a
single plural form per CLDR. Registered in LANGUAGES (22 → 24) with
locale-tag tests. Also adds Devanagari font support (for the upcoming
Hindi catalog) to the fonts crate, and fixes 19 duplicate keys in
ru.tsv that crept in during a previous merge.
Tests: 110 passed, 0 failed.