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Make dialect-specific clause words non-reserved #1240

Job	Run time
Gradle Check (ubuntu-latest)	3m 59s
Gradle Check (macos-latest)	4m 21s
Grammar Choice Conflicts	26s
Gradle Check (windows-latest)	4m 24s
Maven Verify (ubuntu-latest)	4m 14s
Maven Verify (macos-latest)	6m 34s
Maven Verify (windows-latest)	4m 55s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	28m 53s