Pin loaders fixes

Change text of product URL to Buy It Here (Get It Here in the case of edition)
Change text of ling URL to Source URL
Only numbers in the image names. Notice: the path is the same as the initial of the image, so only numbers in the path.
Show a loading indicator in /admin/input/ to know when the upload is finished.
Support multi-word tags like: #simple #multi word #this is awesome.