- An empty select "" carries no key=: the prompt keys go from the
scenarios and from the locale files.
- Scenario option strings live only in scenarios_<lang>.properties; the
duplicates in en/ru.properties are removed.
- English names/info for the map zones (mapzone/home, town_entry).
- locale/scenarios_ru.properties: Russian scenario strings get their own
file next to scenarios_en.
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