Fix quota text shown escaped

Fix quota text shown escaped

"t()" escapes and sanitizes the returned text by default, so strings
like "<" are converted to "&lt;". However, the "jQuery.text()" parameter
does not need to be escaped, as "&lt;" is shown literally as "&lt;"
rather than "<". Now "jQuery.html()" is used instead, which "unescapes"
the given text and sets it as a new text node (as the text in the
parameter does not contain markup for elements, only text).

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>