Textinput: Do not concatenate clearBtnText value into HTML snippet

clearBtnText must be assigned via .attr( "title" ) to the title and via .text()
to the contents of the clear button anchor.

Do not append clear button to textarea elements.

(cherry picked from commit 5197c1078b05b07a643d570aee2a314201fc888a)

Closes gh-7604
Fixes gh-7603
Fixes gh-7605