Add ru.tsv with the full interface coverage: every menu string, every
tl! literal, the plurals (one/few/many) and the status/error messages
(@msg). Registered as complete_menus with the Russian plural rule;
every ru-* locale resolves to it. Keeps the product, workspace and
perspective preset names in English like the other complete catalogs.
Tests: russian_reads_as_russian, russian_plurals_have_three_forms,
russian_glyphs_are_available_without_system_fonts; ru added to
KEEPS_MENU_NAMES and COMPLETE_MESSAGES.
Clean-room: written from the meaning of the English labels in the
vocabulary Russian-speaking users of vector illustration software know
(Слой, Образцы, Обработка контуров, Монтажная область, Обводка,
Заливка), matching the Russian catalog of the sibling app PhotoCraft.
No other application's localisation was copied.
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