Downloading ICU files on first run makes Ou Dedetai slow to open

[n8marti]

The ICU files are checked for and downloaded before the GUI can appear, which makes the app seem to either not start or run very slowly. On a slow connection the user can be waiting for 30 seconds or more before seeing the app. Possible remedies:

• Install ICU files in background thread
• Don't check for ICU files when oudedetai runs, but rather when the installer or installed app are run

[thw26]

Could we put in a check as a third option of, run the check if the app is installed already, and then couple that without a background thread?

My only issue with this is we need to update the ICU files before run, preferably, so we would need to tell the manager not to launch Logos until ICU has finished updating.