The search icon is wrong displayed on l10n page

Steps to reproduce:

1. Open l10n.xwiki.org
2. Search something in the "Search" field
   1. First of all, you see that the search icon is not well displayed, in the right of the "Search" field (see the "Before" image)
   2. After you searched the word, you see that the "Search" icon is overlapping into the "Search" field (see the "After" image)