The problem is the link to the font files in the bootstrap.css file.
Edit the bootstrap.css file. Search for @font-face
in the file and fix the font file location references for the src attributes:
@font-face {
font-family: 'Glyphicons Halflings';
src: url('#WORKSPACE_IMAGES#glyphicons-halflings-regular.eot');
...
}
Please note that you can’t use substitution strings in workspace or application files. If you want to do so, move the CSS rule to your page template(s) (or in the page attributes) as inline CSS.