I'ld like to provide module specific translations for my custom modules. I followed the instructions in https://api.drupal.org/api/drupal/core!modules!locale!locale.api.php/group/interface_translation_properties/8.
But if I install the module no translations get imported. I've searched a lot for examples on the net, but it seems as no one else used it until now.
Here's my module "custom_module"
custom_module.info.yml:
name: 'Custom module'
version: '8.x-1.0'
core: 8.x
project: 'custom_module'
datestamp: 1434014760
interface translation project: custom_module
interface translation server pattern: modules/custom/custom_module/custom_module-%version-%language.po
and a "custom_module-8.x-1.0.de.po"-file with some messages in the module folder.