Updating Portuguese translation

Updating the pgtext value in the base Portuguese translation to no
longer be in English.
Update ui.jqgrid.css
Fix font size

jQuery UI (see [here](https://github.com/jquery/jquery-ui/blob/1.10.3/themes/base/jquery.ui.theme.css#L24-L30)) defines already rules with two selectors (`.ui-widget input`). The suggested rule force usage of the correct font inside of grid view.
Fix text-overflow:ellipsis for Mozilla
removing usage of global cancelPrm variable
Update grid.inlinedit.js

Initial value `{}` of `cancelPrm` or `tmpParams` will be always overwritten. Usage `o.editParams` during initializing reduces the code a little.
fixing usage of `if(undefined>=0)`

The condition `if(fr >= 0) {` can be used with `fr=undefined`. In general `undefined>=0` is false, but initializing of `fr` to `-1` seems me more reasonable.
fix the name of jQuery UI CSS class ui-corner-bottom
fix usage of $elem.val(undefined)
fix calling of custom_value with "set" and undefined value
replace 0px to 0
replace 0px to 0
replace testing for undefined to the testing for null or undefined to prevent warning of usage cm.searchtype below
replace 0px to 0
fixing possible usage of null.toString() or undefined.toString()
prevent exception in case of usage footerData(null, ...)
Merge pull request #533 from meh-uk/portuguese

Updating Portuguese translation
Merge pull request #534 from OlegKi/master

small fixes found with respect of JetBrains ReSharper 8.0.2
Moving afterShowForm evenyt in Form Edit so that we can trigger the button events. Thanks to Oleg
Merge branch 'master' of git@github.com:tonytomov/jqGrid.git