Improve grammar consistency

f953b15a · Thomas Rientjes · c843662a · f953b15a
Commit f953b15a authored Apr 03, 2017 by Thomas Rientjes
--- a/locale/en-US.properties
+++ b/locale/en-US.properties
@@ -12,5 +12,5 @@ learn_more_label = Learn More
 js_on_https_sites_only = JavaScript is disabled on non-HTTPS sites.
 js_disabled = JavaScript is disabled by default on all sites.
 limit_typography = Some fonts and math symbols are disabled.
-limit_graphics_and_typography = Some fonts, icons, math symbols and images are disabled.
+limit_graphics_and_typography = Some fonts, icons, math symbols, and images are disabled.
 tap_to_play_media = Audio and video (HTML5 media) are tap-to-play.