Question messages.po-files in dev enviroment

For testing, I wanted to create the actual dev-version on my local wamp-server. Of course I performed before staring a fresh install of the dev-version. At setup (in German) I become the error message that the messages.po in /resources/lang/de isn't there. This was easily solved by downloading it from github.

My question: on downloading the github-repository none of the messages.po-files are included in the dev-zip-file. So they need to be downloaded one by one. 
Is this correct? Or should they be included in the dev-zip-file of the main repository?

I guess you have taken an "export" of the code - which excludes all files not used in releases.

The build process for releases combines this "export" with the language files (converted from PO to PHP) to create the actual release.

If you intend to do any development, you should clone the source code repository using:

git clone github.com/fisharebest/webtrees

You now have two options.

1) Use this copy of the source code directly. Just run "composer install".
messages.php files will be created automatically from messages.po on first use.
This contains test scripts, tools, etc.

2) Create a release based on the current dev code.
Run "composer webtrees:build"

This script is used to build official releases, and will generate a file webtrees-VERSION.zip.

Okay, I just tried to clone and build. I got some error messages because of failing testcase.

By cloning the folder tests and its subfolders don't come with, as you can see

Should the be the case?
And by missing the testcases the build gives me a

> Should the be the case?

No. I would expect you to have the tests folder

I just tried it.  Works for me. I typed these commands

It produces a file webtrees-XXXX.zip.

If you've checked out a specific tag, the XXX will be the tag name. Otherwise it will be a random-ish string.

Well, then I suspect this error message will explain, why the clone is not complete.
 

I'll try another way to get the clone

If you are short on disk-space, use "git clone --depth=1".

This just downloads the latest version of each file, not all the historic versions.

It needs about 1/10th of the disk space.

yeah, that was the trick!

But, I still get an error on the build: So, the messages.php aren't being created.