change frozen concepts to be lowercase

Author: tanyaparker

dashboard/config/videos.csv

@@ -74,6 +74,6 @@ C3_internet			mFOUbqYv1Sc	http://videos.code.org/2014/C3-internet.mp4
 C3_crowdsourcing			IqZMnfxqEfY	http://videos.code.org/2014/C3-crowdsourcing.mp4
 C3_functional_suncatchers			d1MdyeXy0v0	http://videos.code.org/2014/C3-functional-suncatchers.mp4
 C3_songwriting_with_parameters			5iDCKkI6y2Y	http://videos.code.org/2014/C3-songwriting-with-parameters.mp4
-Frozen_intro	Artist Intro Frozen_intro		H1-paxNG4kw	http://videos.code.org/2014/Frozen-intro.mp4
-Frozen_loops	Repeat times block	Frozen_loops	d7e48cYq7uc	http://videos.code.org/2014/Frozen-loops.mp4
-Frozen_functions	Functions	Frozen_functions	0eo0ESEX9DE	http://videos.code.org/2014/Frozen-functions.mp4
+Frozen_intro	Artist Intro frozen_intro		H1-paxNG4kw	http://videos.code.org/2014/Frozen-intro.mp4
+Frozen_loops	Repeat times block	frozen_loops	d7e48cYq7uc	http://videos.code.org/2014/Frozen-loops.mp4
+Frozen_functions	Functions	frozen_functions	0eo0ESEX9DE	http://videos.code.org/2014/Frozen-functions.mp4