[modules] add |forceescape Nunjucks filter

Temporal solution of mozilla/nunjucks#782

CHANGELOG.md

@@ -5,6 +5,9 @@
 ### Removed
 - [sass] Removed all `$ekzo-enable-*` options in favor of modular imports. Now just comment out import of part, which you don't want to use.
 
+### Added
+- [modules] Added `|forceescape` filter for Nunjucks as temporal solution of https://github.com/mozilla/nunjucks/issues/782
+
 ### Changed
 - [sass] Updated Ekzo to version 2.0.0.
 - [misc] Renamed Ekzo submodule directory from `ekzo.sass` to `ekzo`.

modules/nunjucks-extensions.coffee

@@ -9,6 +9,7 @@ numbro       = require('numbro')
 moment       = require('moment')
 smartPlurals = require('smart-plurals')
 { join }     = require('path')
+{ escape }   = require('nunjucks/src/lib')
 
 module.exports = (env, grunt, currentLocale, numberFormat, currencyFormat) ->
 
@@ -249,4 +250,14 @@ module.exports = (env, grunt, currentLocale, numberFormat, currencyFormat) ->
     for property, value of input
       spreaded += "#{property}='#{value}' "
 
-    return spreaded
+    return spreaded
+
+  ###*
+   * Same as Nunjucks `|escape` filter, but enforces escaping in any case, even if input previously has been
+   * marked as `safe`. Can be applied on `caller()` of `macro` to enforce escaping of its content
+   * @todo  Temporal solution for https://github.com/mozilla/nunjucks/issues/782
+   * @param {string|object} input Entity in to be escaped
+   * @return {string} Escaped entity
+   * @example {{ caller()|forceescape }} -> <p>Example text</p>
+  ###
+  env.addFilter 'forceescape', (input) -> escape(input)