Translate validation section of docs into Russian

[ArduanovDanil]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	❌

[what-the-diff[bot]]

PR Summary

• New Documentation Guides Added Five new guides have been added to the documentation which explain various features of the Yii Validator package. These include an overall guide, a guide on conditional validation, a guide on customizing error messages, a guide on understanding validation results, and a final guide on the actual use of the validator.

• Modifications in 'using-validator.md' The usage guide for the validator was expanded with more content. It now includes instructions on how to use the validator with different types of data - single value, an array, an object or a custom dataset. Other than that, examples showcasing how to apply various rules with the validator have been added too for better understanding. The guide also highlights essential usage notes on certain rules and features for better user experience.

[samdark]

Thanks!