Add basic accessible language switcher dialog

[sbesh91]

This PR adds a language switcher dialog to the site. The emphasis is on making it keyboard and screen reader accessible instead of over-styled.

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[mtom55]

Couple of changes:

The selection of languages should be in the original language for each selection

or optionally English / English Espanol / Spanish

and the should also be in the language.

and I was thinking if we could add a grey world icon like in the OWA logo to the left of the text.

[sbesh91]

Couple of changes:

The selection of languages should be in the original language for each selection

or optionally English / English Espanol / Spanish

and the should also be in the language.

and I was thinking if we could add a grey world icon like in the OWA logo to the left of the text.

Yeah, I think all of that is reasonable and doable.

[mtom55]

I meant more like a globe like https://fontawesome.com/icons/globe?f=classic&s=light (if we can find a royalty free version) rather than the OWA logo, and on the home page rather than the pop-up dialog

[sbesh91]

I meant more like a globe like https://fontawesome.com/icons/globe?f=classic&s=light (if we can find a royalty free version) rather than the OWA logo, and on the home page rather than the pop-up dialog

I understand now. I'll get that updated.

[mtom55]

This page still needs each option in it's original language:

i.e. instead of: English Spanish

it should be

English Español. Languages and close can be in the current language that is set.

To the left of the language selector we should also have the icon on the menu:

[mtom55]

Looks great!