Update Brazilian Portuguese translation

Add row `formatAjaxError` and update when `formatInputTooShort` value equal to 1
allow formatSelection to return a jQuery object
Testing if the object exists before use it

It's necessary to make the code compatible with IE8 and IE9.
Merge pull request #2720 from josmardias/fix-ie8-ie9

Fixing IE8 and IE9 issues on select2#3.5.1
Merge pull request #2702 from dgroux/master

allow formatSelection to return a jQuery object
Merge pull request #2690 from marcelod/patch-1

Update Brazilian Portuguese translation
'document.body' instead of 'body' selector
Merge pull request #2728 from demkalkov/master

'document.body' instead of 'body' selector