Add data-tooltips to side navigation icons

[leonsabr]

Context

In collapsed state this tooltips really help for newbies. New rule: no data-tooltips in Expanded state.

Checklist

• Sign Allure CLA
• Provide unit tests this is just an icon's tooltip

[baev]

@leonsabr could you please rebase and fix eslint issues:

/home/jenkins/workspace/allure2_PR-406-IVALK3T4KECVVADYDPI7Z7ECZ27P5BEPAU2C5RDQFQNKSV573WCA/allure-generator/src/main/javascript/components/side-nav/SideNavView.js
  2:24  error  'behavior' is defined but never used  no-unused-vars

✖ 1 problem (1 error, 0 warnings)

[leonsabr]

I have squashed all commits.

[just-boris]

@baev it just makes me curious, why did you remove the tooltip here: 38836f7

[leonsabr]

Second commit adds translations for Expand tooltip.

[baev]

@leonsabr thanks!