Merge branch 'checklinks' into 'master'

add check links and remove the old training link

See merge request !3

slides/ui/i18n/slides.css

-@import url(s5-core.css); /* required to make the slide show run at all */
-@import url(framing.css); /* sets basic placement and size of slide components */
-@import url(pretty.css);  /* stuff that makes the slides look better than blah */
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