validate add up just 2 folders and 2 pictures by level

- Improve code to return message
- Improve form code to display error message
- Move JS code to Gallery.erb
- Delete  code for display name on load file
Merge pull request #19 from ariel-cossio/Control-to-add-up-to-2-folders/pictures-for-unverified-accounts

validate add up just 2 folders and 2 pictures by level