openlayers/ol3 — pull request #1713 by elemoine (2014-02-16 22:23:20+00:00)
Title: Use minus sign as zoom out label

This fixes an issue raised by @sbrunner in https://github.com/openlayers/ol3/commit/1215f582414d34d64485482a1ec7946de4bd0fe5#commitcomment-5389801.