Entity Translation Copy

Problem:
You are given the task of updating an existing site (with content in it) to be multilingual. You do the steps on your local environment to make entities/nodes translatable (Following this guide) and then decide to export the configuration with features. You also decided you want to translate the title field so you used the title module to make titles translatable.

However as soon as you start playing around on the your test server for example, you notice that titles are not shown, while the content for sure had a title before.

TL;DR
You're using Entity Translation with the option "with field translation" in combination with the title module and used features to deploy the changes, you notice existing content is not being displayed correctly because the data is still saved in the 'und' language or still only exists in the old field (in case from title field).

Solution:
This module will give you the option to copy the values of the fields (which are set to be translatable) into the default site language just like it would do if you would configure the entity/node manually and select the checkbox "copy translations".