Markust,
Step 1. Create your own bold button and rename it to myBold.gif
Step 2. Copy it to the CuteSoft_Client/CuteEditor/Themes/ThemeName/Images/
Step 3. Open CuteEditorSolution\EditorWebsite\CuteSoft_Client\CuteEditor\Configuration\AutoConfigure\Default.config
Change
<item type="image" name="Bold"/>
to:
<item type="image" name="Bold" imagename="myBold" />
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