Update l20n.js
Use regular bindings for the initial localization of the front page

We don't have to call update() when we initialize the editor, because the page
can be localized using the regular L20n bindings for HTML.

We need to modify the bindings file to assign to innerHTML instead of
textContent (just like the special bindings do) to work aroound bug 866100[1].

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=866100
Merge pull request #4 from stasm/use-l20n-bindings

Use l20n bindings