Translate messages 'getting and select release' theme:install (#253)

* Translate messages 'getting and select release' theme:install

* Add translate message Downloading theme 'theme' release '8.x-'

* Add translate message Theme name-theme version 8.x- was downloaded successfully at

Author: gilbertomangones

translations/theme.install.yml

@@ -19,6 +19,10 @@ messages:
   theme-default-success: 'The "%s" theme has been installed successfully as default theme'
   disabled-themes: 'Only uninstalled themes will be listed in autocomplete'
   invalid-theme-default: 'Option default is only valid for one theme'
+  getting-releases: 'Getting releases for theme "%s"'
+  select-release: 'Please select your favorite release'
+  downloading: 'Downloading theme "%s" release "%s"'
+  downloaded: 'Module "%s" version "%s" was downloaded successfully at "%s"'
 examples:
   - description: 'Install theme specifying the name'
     execution: |