Issue 1655 - Add "short_name" to manifest.json for Chrome and Opera

manifest.json.tmpl

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 {
   "manifest_version": 2,
   {%- if releaseBuild %}
   "name": "__MSG_name__",
   {%- else %}
   "name": "__MSG_name_devbuild__",
   {%- endif %}
 
+  "short_name": "__MSG_name__",

[Thomas Greiner, 2014/12/03 15:47:22]

Since this field is limited to 12 characters I'd recommend mentioning this
restriction in the description for the extension name in messages.json.

[Sebastian Noack, 2014/12/03 15:57:44]

This string is imported from Adblock Plus for Firefox. And I rather not advice
translators to keep it unnecessarily short, given that this field is only used
in very rare cases if at all, while the length virtually doesn't matter
elsewhere this string is used. Also note that it is truncated in
packagerChrome.py anyway in case it has more than 12 chars. Also note that the
name (i.e. "Adblock Plus") isn't usually translated anyway.

[Thomas Greiner, 2014/12/03 16:19:38]

Ok, that's fine then.

   "description": "__MSG_description_{{ type }}__",
   "default_locale": "en_US",
   "version": {{version|json}},
 
   {%- if metadata.has_section('compat') and metadata.has_option('compat', 'chrome') %}
   "minimum_chrome_version": {{metadata.get('compat', 'chrome')|json}},
   {%- endif %}
 
   {%- if not releaseBuild and type != "chrome" %}
   "update_url": "https://adblockplus.org/devbuilds/
@@ skipping 47 matching lines @@
   {%- if contentScripts %}
   "content_scripts": {{contentScripts|json}},
   {%- endif %}
 
   {%- if webAccessible %}
   "web_accessible_resources": {{webAccessible|json}},
   {%- endif %}
 
   "_dummy": false
 }