Merge branch 'add-ie-compat-notice' into 'master'

Added info about common UI problems if IE Compatibility View mode is enabled.

/cc @sytses @Haydn

See merge request !939

doc/install/requirements.md

@@ -109,4 +109,8 @@ On a very active server (10,000 active users) the Sidekiq process can use 1GB+ o
 - Firefox (Latest released version and [latest ESR version](https://www.mozilla.org/en-US/firefox/organizations/))
 - Safari 7+ (known problem: required fields in html5 do not work)
 - Opera (Latest released version)
-- IE 10+
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+- IE 10+
+
+### Common UI problems with IE
+
+If you experience UI issues with Internet Explorer, please make sure that you have the `Compatibility View` mode disabled.
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