Add Russian language

[RChutchev]

Adding translation to Russian language to the v.1 branch.

[what-the-diff]

PR Summary

• New Russian Language Support
  This update adds a new Russian language file, allowing for a fully translated user interface in the Google Analytics dashboard.
• Dashboard Labels and Titles
  The update includes Russian translations for various labels and titles, improving navigation and user experience for Russian-speaking users.
• Widget Headings/Labels
  Appropriate Russian translations for analytics widgets like page views, unique visitors, and sessions have been included, making data more accessible and comprehensible.
• Date Range Filter Labels
  Filter labels for date ranges have been translated into Russian, increasing ease of use for users who want to view data from different time periods.
• Trend Labels
  Labels describing trend directions have also been translated, allowing users to easily understand the trajectory of their data.