rather modify bootstrap_min.css than insert into .htaccess rewrite rules
  Redirect 301 /fonts/glyphicons-halflings-regular.woff2 /ext/bootstrap/fonts/glyphicons-halflings-regular.woff2 Redirect 301 /fonts/glyphicons-halflings-regular.woff /ext/bootstrap/fonts/glyphicons-halflings-regular.woff Redirect 301 /fonts/glyphicons-halflings-regular.ttf /ext/bootstrap/fonts/glyphicons-halflings-regular.ttf Redirect 301 /fonts/glyphicons-halflings-regular.eot /ext/bootstrap/fonts/glyphicons-halflings-regular.eot Redirect 301 /fonts/glyphicons-halflings-regular.svg /ext/bootstrap/fonts/glyphicons-halflings-regular.svg but the best would be just use awesome font icons only.