.langSwitcher
.langSwitcher + . lagSelector

Basic styles to this markup
Behavior to active .langSwitcher + . lagSelector

- Some simple JS code to activate the switcher;
- Necessary styles to make it work;
.main.switcherOn

- Adjustment to avoid a obstruction in .mainNav on mobile devices;
Fix wrong path to languages folder
Avoid user to access /lang/ folder

- Redirect to /pt-br/ version
Fix wrong "eng" folder name to "en"