Same accessibility fix as the one merged into 5.7.x (#3978)
Same accessibility fix as the one merged into 5.7.x (#3978)

* WCAG fix for Share This Page block

* PSR cleanup to WCAG tweak


Former-commit-id: 770ac487456df9a7fb2c97bb049f49476d5b02c2
Former-commit-id: 680eb0eec487dfa1bdb6620519d857b1aed140c0
mlocati/concrete5,MrKarlDilkington/concrete5,rikzuiderlicht/concrete5,mainio/concrete5,biplobice/concrete5,concrete5/concrete5,mainio/concrete5,triplei/concrete5-8,jaromirdalecky/concrete5,olsgreen/concrete5,rikzuiderlicht/concrete5,hissy/concrete5,biplobice/concrete5,MrKarlDilkington/concrete5,KorvinSzanto/concrete5,mlocati/concrete5,concrete5/concrete5,KorvinSzanto/concrete5,deek87/concrete5,biplobice/concrete5,KorvinSzanto/concrete5,haeflimi/concrete5,jaromirdalecky/concrete5,haeflimi/concrete5,acliss19xx/concrete5,rikzuiderlicht/concrete5,a3020/concrete5,MrKarlDilkington/concrete5,a3020/concrete5,triplei/concrete5-8,jaromirdalecky/concrete5,acliss19xx/concrete5,concrete5/concrete5,deek87/concrete5,biplobice/concrete5,hissy/concrete5,mainio/concrete5,haeflimi/concrete5,triplei/concrete5-8,hissy/concrete5,deek87/concrete5,mlocati/concrete5,hissy/concrete5,deek87/concrete5,olsgreen/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,olsgreen/concrete5,haeflimi/concrete5,acliss19xx/concrete5,concrete5/concrete5