Add fullscreen support to album and photo views

[kamil4]

Finally takes care of my pet project #94

Front end part is at LycheeOrg/Lychee-front#52

[ildyria]

Because we are using the blade template, this will break for any non-English language.

Please add the 2 lines into the other languages (even if not translated) in order to avoid a key not defined when trying to get $locale['FULLSCREEN_EXIT']

[kamil4]

My latest commit should address this. @d7415 do I need to do the same with #228? I added the locale strings there but then I realized that index.html isn't localized...

[d7415]

My latest commit should address this. @d7415 do I need to do the same with LycheeOrg/Lychee#228? I added the locale strings there but then I realized that index.html isn't localized...

I think it's fine. I don't think Lychee does any localisation itself, only the front-end.

Lychee-front does update some of index.html (the star one in particular I've noticed when playing) but that's out of scope (and I think falls back to the values in lychee_locale.js anyway)