(bug 44228) Replacing "textContent" with "nodeValue"

Using "textContent" in wb.utilities.ui.buildPrettyEntityLabel is not necessary
and incompatible to IE < 9.

Change-Id: If04358e66c70e4a4a6f711fdf0fa248cf60d6998
Merge "(bug 44228) Replacing "textContent" with "nodeValue""