Translations are not updated when dynamically loading PCK

[mihe]

Tested versions

Reproducible in 4.4.dev [ef8d981]

System information

Windows 11 (10.0.22631)

Issue description

When including updated translation files as part of an exported PCK file that's meant to be dynamically loaded at runtime, you currently have to manually load each *.translation file after having loaded the PCK in order for the updated translations to actually have any effect.

The expected behavior would be for the updated translations to be loaded as part of loading the PCK.

Steps to reproduce

(The MRP includes a patch.pck file that was exported using the patch system introduced in #97118, where the translation with key HELLO was changed from "Hello" to "Howdy" before exporting.)

1. Open the MRP.
2. Run the main scene.
3. Note how the label says "Hello".
4. Uncomment the ResourceLoader.load line in main.gd.
5. Run the main scene again.
6. Note how the label now says "Howdy".

Minimal reproduction project (MRP)

localization-patching.zip