Tests fail on OS with other configured language

[teamplayer3]

When I run the tests from main on my local hardware (german lang), tests missing_manifest and patch_path_doesnt_exist fail.

missing_manifest

I don't know why this is failing.

    2     2 │ Caused by:
    3     3 │     `cargo metadata` exited with an error: error: failed to parse manifest at `[TEMPDIR]Cargo.toml`
    4     4 │     
    5     5 │     Caused by:
    6       │-      virtual manifests must be configured with [workspace]
          6 │+      manifest is missing either a `[package]` or a `[workspace]`

patch_path_doesnt_exist

OSERROR is printed in the user's configured OS lang.

    0     0 │ error: Unable to run `cargo metadata`
    1     1 │
    2     2 │ Caused by:
    3       │-    0: failed to start `cargo metadata`: [OSERROR]
    4       │-    1: [OSERROR]
          3 │+    0: failed to start `cargo metadata`: Der Verzeichnisname ist ungültig.[OSERROR]
          4 │+    1: Der Verzeichnisname ist ungültig.[OSERROR]