[BUGFIX] class attributes are dropped from p and div tags

Configuration/TypoScript/pageTSConfig.ts

@@ -52,7 +52,7 @@ RTE.default.proc {
 	## Attributes class and align are always preserved
 	## Align attribute will be unset on entry (see below)
 	## This is a list of additional attributes to keep
-	keepPDIVattribs = id, title, dir, lang, xml:lang, itemscope, itemtype, itemprop, style
+	keepPDIVattribs = id, title, dir, lang, xml:lang, itemscope, itemtype, itemprop, style, class
 
 	## REMAP BOLD AND ITALIC TO STRONG AND EMPHASIS AND VICE VERSA
 	transformBoldAndItalicTags = 1