Search icon not shown

After installing the search feature and adding the Search Box to the top container, an image is not shown next to the search box. (I guess it should be some magnifier glass icon).
There are some 404s that probably are the cause:

http://localhost:8080/site/fonts/glyphicons-halflings-regular.ttf
http://localhost:8080/site/fonts/glyphicons-halflings-regular.woff
http://localhost:8080/site/css/bootstrap.css.map