The Feedback module (v 5.00.02) makes use of the standard core methods for localization of static text. This phrase may be changed (for an entire portal) by navigating to Admin-->Languages then . . .

For DNN 5.5.x:

1. Click on the Edit pencil in the column "Static Resources Site" for your prefered culture (only en-US installed by default)
2. Expand the the following nodes of the Resources tree: Local Resources, DesktopModules, Feedback, App_Local Resources
3. Click on Feedback.ascx and locate the resource named "MessageSent.Text"
4. Change the text in the text area to the right (Localized Value) or click on the edit pencil at the right to use the standard DNN rich text editor for more extensive changes.
5. Click on "Save Resource File"

For Earlier Versions-DNN 5.02.03 - 5.04.04

1. Select desired locale from the drop-down list of Available Locales
2. Expand the following nodes of the Resources tree: Local Resources, DesktopModules, Feedback, App_LocalResources
3. Click on Feedback.ascx and locate the resource named MessageSent.Text
4. Change the text in the lefthand text area (Localized Value) or click on the Edit pencil to use the standard DNN rich text editor for more extensive changes.
5. Click on "Save Resource File"

As you can see, other static text can easily be changed as well.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner

If you are referring to the default text "Security Code", that should follow whatever color and background is defined in your skin css for the SubHead class although the module also applies the css class Feedback_CaptchaLabel (defined in DesktopModules\Feedback\module.css) to its containing div. On the otherhand, the default text "Enter the code shown above into the box below" is rendered as part of the core Captcha control which does not apply a css rule to it's containing element directly. It should, however, follow what ever color and background is defined in your skin css for the Normal class. If that doesn't take care of it, you might have to add an additional css definition to module.css to target that element more specifically. A css selector of  ".Feedback_CaptchaControl div div" should work.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner