fix some gramatics

3. quite cumbersome formulation
6. grammatically incorrect word forms
9. duplicate verb in wrong form
Merge pull request #148 from CorneliuRusu/master

Corneliu Rusu (HTP): Localized fr.md
Corneliu Rusu (HTP): Fixed URL in #4

Please, merge this small correction as well
Merge pull request #149 from CorneliuRusu/patch-1

Corneliu Rusu (HTP): Fixed URL in #4
Review fr
Merge pull request #152 from TheoChevalier/fix-fr

Full review for French
Create UP_research_addon_privacy_notice
Update UP_research_addon_privacy_notice
Add Bengali Mozilla Privacy Policy
Add Czech Mozilla Privacy Policy
Add German Privacy Policy
Add Greek Privacy Policy
Add Spanish Mozilla Privacy Policy
Add French Mozilla Privacy Policy
Add Hindi Mozilla Privacy Policy
Add Croatian Mozilla Privacy Policy
Add Hungarian Mozilla Privacy Policy
Add Italian Mozilla Privacy Policy
Add Macedonian Mozilla Privacy Policy
Create Polish Mozilla Privacy Policy