#913 Language files

There are a great many language files now in the 'languages' folder. This is making it harder to follow the recomendation regarding space saving, of deleting any language file not required. It would be helpful if each language set was in its own sub-folder.

An alternative, but I suspect harder, would be to put the language code (e.g. the 'en' of english files) at the start of the name rather than the middle - then they could be sorted by language, making selection and deletion easier.

[Wes Groleau]

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If ever such a rearrangement is started, I suggest an additional change at the same time:

For any language that has dialect files, have three levels.

So if someone selects español argentino, PGV would
read lang.php for the English defaults
then override with es/lang.php
then override with a much smaller es/ar/lang.php
(then es/extra.php and es/ar/extra.php)