Localization: set html tag lang attribute

Signed-off-by: andrewdworn <andrewdworn@gmail.com>
Localization: chosen.js plugin

Signed-off-by: andrewdworn <andrewdworn@gmail.com>
Added spanish translations.
Added basque translations.
hiding primary keys
fixing multiple constraints issue
Updating readme to 3.2.0
Fixing item link positioning in the absense of the key field
Merge remote-tracking branch 'martxel/master' into 3.2.0
updating changelog and docs for @martxel PR
Fixing issue with key field returning null instead of 0
D'oh spanish is es
Merge pull request #86 from andrewdworn/localization

Localization fixes
Translated new strings (es and eu).
Merge pull request #87 from martxel/master

Translated latest strings (es and eu)
Dutch translation
Merge pull request #99 from pjeutr/translate_nl

Dutch translation 2
Adding dutch to languages
Adding dutch to languages
Added Polish translations