Avoiding multi-language events (see #7)

.github/ISSUE_TEMPLATE/event.md

@@ -4,7 +4,11 @@ about: Template for suggesting/requesting events and noting topic ideas.
 
 ---
 
-<!-- Please add a descripitive title what this event will/should be about and fill out the following details -->
+<!--
+Please add a descripitive title what this event will/should be about and fill out the following details.
+If it is specific to a programming language, please add its name to the title.
+If covering the same topic in different languages could fill more than 1 hour, please create one issue per language!
+-->
 
 #### What should/will the [learning objective(s)](http://teachtogether.tech/en/process/#s:process-objectives) be?