String changes required to facilitate customized labels on fields in dialogs

[Damian]

1) Link needs a new target label because it is used in both the TAB and for a form field label.

2) Inside of the Common string section URL is being used in several places for example inside of the links plug-in it is being used for both a combo box choice and a form field label. Because we cannot add a colon to a combo box we need a separate label for the one inside of the combo box.

3) Inside of the Image plug-in string section there is a URL string this is inconsistent since all the other plug-ins pull from the common URL string.

4) Inside of links string section there are two strings with the same name Target one of them should be removed.

5) Inside of the image string section there should be a target added to either this section or the common string section currently the Target label is being pulled from a different section this is inconsistent.

6) Inside of image plug-in string section there is a preview string. For all other plug-ins the string is being pulled from the common string section either each plug-in should be given a preview string or the image dialog needs to use the common preview string for consistency.

[Frederico Caldeira Knabben]

Fixed with [5158] in the 3.2.x branch.