You can disable the gallery on a per image field basis by editing the image field within CB > Field Management then under Parameters > Image Gallery set "Allow Gallery" to "Disable".
And also change the text content as described in attached image.
Both are language strings. You can use language overrides as shown below to override and change the text to whatever you like.
www.joomlapolis.com/blog/kyle/18701-language-overrides-have-arrived