Moving a translation file does not update the entry in project settings

### Tested versions

4.7 beta2

### System information

W10

### Issue description

When you move a translation file (tested with `.po` file), the corresponding entry in projects translation list is not updated, leading to errors. Might be a regression (not tested).

Related to #111693 I guess.

### Steps to reproduce

1. Create a .po file
2. Go to Project > Project Settings > Localization > Translations
3. Add the translation file
4. Move the file
5. Go to project settings again
6. See that entry is not updated

### Minimal reproduction project (MRP)

[trantest.zip](https://github.com/user-attachments/files/27757389/trantest.zip)

Reproduce the issue from Project > Project Settings > Localization > Translations using the provided trantest.zip project and a .po file. Trace how the translation entry is stored and refreshed after the file is moved. Done means the project settings entry follows the moved file and no longer produces errors.

Written by the indexing model from the issue text.