Some Customizer control description HTML is being escaped

[coreymckrill4ttf]

In #27981 the esc_html was removed from control description output since they are set programatically, not via user input. However, in 4.1-RC1 I am seeing escaped HTML in the descriptions of image upload controls. My best guess is that this is due to uploader controls now being rendered via JS template.

[celloexpressions]

Don't have time to test right now, but that's likely the issue. The double braces should be replaced with triple braces in the control template {{ data.label/description }} to {{{ data.label/description }}}. Related: #29572, #21483.

[ocean90]

Just the description field

[ocean90]

In 30847:

Customizer: Don't escape control descriptions in JavaScript templates.

fixes #30682 for trunk.

[celloexpressions]

Labels are unescaped for the color control now, so we should probably do the same here.

[johnbillion]

In 30863:

Customizer: Don't escape control descriptions in JavaScript templates.

Merges [30847] to the 4.1 branch.

Fixes #30682.