[FIX] web_editor: allow to copy paste when editing translations

When editing translations, you were not able to copy/paste texts before
this commit. Indeed, in some contexts, in some browsers, copy/pasting
text was creating a new paragraph inside the translation, preventing it
to be saved.

This commit simply adds code to remove these paragraphs each time text
is changed.

A more elegant solution will be found for master with website and
editor improvements.

addons/web_editor/static/src/js/translator.js

@@ -177,6 +177,10 @@ var Translate = Widget.extend({
     },
     rte_changed: function (node) {
         var $node = $(node);
+        $node.find("p").each(function () { // remove <p/> element which might have been inserted because of copy-paste
+            var $p = $(this);
+            $p.after($p.html()).remove();
+        });
         var trans = this.getTranlationObject($node[0]);
         $node.toggleClass('o_dirty', trans.value !== $node.html().replace(/[ \t\n\r]+/, ' '));
         this.$('button[data-action=save]').prop('disabled', !$('.o_editable.o_dirty').length);