[General] implement a more user-friendly date picker

[teodoranegru]

Examples:

[teodoranegru]

it's the same as it was before plus the hour format still has seconds

[teodoranegru]

For all fields type=date picker :

• add an additional clarification to field label to include after the original field label "(zi-lună-an)"
• change placeholder to reflect Romanian language (instead of "dd-mm-yyyy" set "zz-ll-aaaa" placeholder)

[teodoranegru]

The date picker doesn't work as it is supposed to