fixed intro background-color; small ui fixes.

added empty rooms default message; general ux fixes

implemented flex-nav; general ux/ui changed.

Changed emojis UI; Moved ChatMessages to it’s own file; Fixed emojis
arrow-up bug.

Adds a link on login page footer to switch to an alternate language (only available when your default language isn't english)

Proudly making the real initial commit! Congratulations to all involved: Diego Sampaio, Marcelo Schmidt, Rafael Caferati and Rodrigo Nascimento