Improve localized texts rendering

[tanelj]

When localized text (lc filter) are rendered to template as JS values then it should be escaped.

Example:

site.bindContentItemImgDropAreas('{{ "drag_picture_for_product_here" | lc: editor_locale }}');

If FR:

site.bindContentItemImgDropAreas('Faites glisser l'image d'un produit ici à partir du paneau "Fichiers".');

Possible fix:

site.bindContentItemImgDropAreas('{{ "drag_picture_for_product_here" | lc: editor_locale | json }}');