Read-only locales in Pontoon

Hi,

In the past days we have enabled a new feature in Pontoon, and it's now 
possible to add locales to a project in read-only mode.

While it won't be possible to modify or add translations for projects in 
read-only locales, such translations will be available as a Translation 
Memory source for:
* Other projects for these locales.
* Other languages (from the LOCALES tab).

In the coming hours we're going to enable the following combinations of 
locales/projects in Pontoon in read-only mode.

Project: Firefox
Locales: da, it, ja, nl

Project: Firefox For Android
Locales: it, ja, nl

Project: Firefox for iOS
Locales: gl, nl

Project: AMO
Locales: pl

Project: mozilla.org
Locales: et, nl

Italian was already enabled a couple of weeks ago in order to fully test 
the feature.

Please reach out if you notice any issue with this feature in Pontoon.

Francesco