Add sz l10n command to our repo CLI

[nilsreichardt]

The sz l10n should the same as the following VS Code:

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            // This task generates the l10n files for the
            // sharezone_localizations.
            //
            // FVM is required to run this task.
            "label": "Generate l10n for sharezone_localizations",
            "type": "shell",
            // We also format the files after generating the l10n files because
            // the generated files use a different formatting style than the
            // rest of the project.
            "command": "fvm flutter gen-l10n && fvm dart format .",
            "options": {
                "cwd": "${workspaceFolder}/lib/sharezone_localizations"
            },
            "problemMatcher": []
        }
    ]
}