fixed format issue if input has % by escaping

If an input field already has % in the string, after sprintf the error message will look like
array[0 => 1]

This str_replace escapes it and fixes the issue.
Merge pull request #134 from zainengineer/patch-1

fixed format issue if input has % by escaping
fixes duplicate comma separated multiselect
Merge pull request #153 from zainengineer/master

fixes duplicate comma separated multiselect
Revert "fixes duplicate comma separated multiselect"
Merge pull request #155 from avstudnitz/revert-153-master

Revert "fixes duplicate comma separated multiselect"
Merge branch 'develop'
Do not require a value for _media_lable, _media_position or _media_is_disabled.
Fix duplicate email check case-insensitive

Avoids inserting duplicate e-mail with Integrity constraint violation: 1062 Duplicate entry
Merge pull request #158 from brenbl/duplicate-email-case-insensitive

Fix duplicate email check case-insensitive