Add switch locale button

[XaoGao]

After #92 add to navbar dropdown with available locales and when switch update user locale field

[FaxriddinMaxmadiyorov]

@XaoGao Hello, I want to take this issue

[XaoGao]

@FaxriddinMaxmadiyorov ok

[secretpray]

Hello @XaoGao , I want to take this issue

[XaoGao]

@secretpray ok