Added check for running script after updating i18n messages

Author: Matus Kasak

.github/pull_request_template.md

@@ -1,15 +1,10 @@
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 ## Problem description
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 ## Analysis
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+
+If you updated en.json5 or cs.json5 file with translations:
+- [ ] Verify the sync-i18n-files script was executed and any changes are included in this PR.