i18n(ru): expand Russian translation coverage (#8603)
Added missing translations for:
- Profile preferences (language, timezone settings)
- Account settings sections (preferences, notifications, security, api-tokens, activity)
- Workspace settings (billing, exports, webhooks headings/descriptions)
- Project settings (states, labels, estimates, automations headings/descriptions)
- Power-K command palette (contextual actions, navigation, creation, preferences, help)
- Sidebar elements (stickies, your_work, pin/unpin)
- Common actions (copy_markdown, overview)
- Navigation customization options
a3a1d141cb