Center color picker labels
Fix src attribute for upload field
Check for existence of filter_var
Fixed bug in localized string with variables
text_sortable: fixed default value

If value of a field was not set, 'http://' was displayed. Changed to
empty string.
Merge pull request #85 from psaikali/master

text_sortable: fixed default value
Merge pull request #84 from zenideas/master

Fixed a localized string formatting as it was malformed syntax.