Add language switcher

[rdkelley]

[krook]

Contributors can pull from the Pyrrha dashboard using the code here:

• https://github.com/Pyrrha-Platform/Pyrrha-Dashboard/blob/main/pyrrha-dashboard/src/context/app.js
• https://github.com/Pyrrha-Platform/Pyrrha-Dashboard/tree/main/pyrrha-dashboard/src/locales
• https://github.com/Pyrrha-Platform/Pyrrha-Dashboard/blob/main/pyrrha-dashboard/src/components/PyrrhaHeader/index.js#L110

[MohsinNajmuddin]

@rdkelley I can look into it.

[MohsinNajmuddin]

@rdkelley Please assign it to someone else. I might get late

[JohnyTheCarrot]

I'll do this.