Product Image not showing in backend and can't upload image

[12impress]

Preconditions

1. Magento 2.1.3
2. PHP 7.0.8
3. MySQL 5.6.30

Steps to reproduce

1. Clean install and added products by CSV
2. Everything looks good at the store front
3. By adding a new product manually, image is not uploading.

Expected result

1. Normally the image has to be upload

Actual result

1. When Edit or add new product in admin (backend) the product image doen't show up
2. When choosing image to upload, nothing happens

[Screenshot, logs]

[12impress]

I found the issue and it is a bug in Magento. Also updated to 2.1.4 but still the same issue.

The problem is in the language files.

I followed the next steps:

Set Configuration -> General -> Locale Options -> Locale

For Default Config: admin language (English) US

Also check if your admin language is set to en_US.

I did now:
Delete /pub/static/_requirejs
Delete /pub/static/adminhtml
Delete /pub/static/frontend

SSH
php bin/magento setup:static-content:deploy
php bin/magento cache:clean

Now I can add and edit images like normal. But I am missing a lot of tekst om my screen.

When I deploy all languages, I have the issue again....

[12impress]

It looks like this issue, but this is not my solution:
#7862

[alrayn]

What we can do ?

It's a major issue.

[12impress]

I solved it..!
I made a clean setup from Magento. Than connect the old database.
Now the problem was solved.