Merge branch '2.3' of ezsystems/ezplatform-richtext into 4.6 #817

Job	Run time
Solr integration tests	59s
Run code style check (8.0)	35s
Tests (7.4)	31s
Tests (8.0)	39s
Tests (8.1)	33s
MySQL integration tests (7.4)	1m 23s
PostgreSQL integration tests (7.4)	1m 18s
MySQL integration tests (8.0)	1m 26s
PostgreSQL integration tests (8.0)	1m 10s
MySQL integration tests (8.1)	1m 28s
PostgreSQL integration tests (8.1)	1m 2s
	11m 4s

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