Updated pt_PT localization to new format

Also changed some item strings, since there are localizations for some
of the items in the portuguese dictionary, such as minium -> mínio
Merge https://github.com/pahimar/Equivalent-Exchange-3
Corrected the key format for localizations

Took me a while to figure out what was wrong--I must get my eyes
checked.
Merge pull request #427 from RedRoserade/master

Updated pt_PT localization to new format