I configured webdav in a multi language site (4 languages). When I browse the site through webdav, at root level, I can see the 4 language folders (in my case ita, eng, fre and ger).
When I upload an image, for example in /ita/media/images, overwriting an existing one, if this image exists only in default language (italian), it works fine (ezp create for me a new version of the object in italian). If I have an image translated in 2 or more languages, when I upload the same image overwriting it, for example always from /ita/media/images, ezp create the new version of image object, but <b>in the last translated language</b> instead of the folder/siteaccess language. Example: If I have translated an image object, through admin interface, the last time in german, if I upload the italian version from ita folder via webdav, ezp create the new version in the last language, in this case in german

Steps to reproduce

1. Make a fresh installation of eZp 3.10.1 choosing 4 languages during setup
2. Enable webdav editing /settings/override/webdav.ini.append.php:

[GeneralSettings]
EnableWebDAV=true

3. add the following lines in the virtual host configuration:

RewriteCond %{HTTP_HOST} ^webdav\..*
RewriteRule ^(.*) /webdav.php [L]

ServerAlias webdav.example.com

4. From the admin interface, under media/images, create an image object in the default language (eng) and translate the image object in all others language (fre, ita, ger)
5. Trough webdav client, go in /eng/media/images and overwrite the just created image with another one with same name
6. Go in the admin interface->media->images and check the new version of the just overwritted image: expected result is a new version in eng, but the new version will be in the last translated language, in this case german