Language ordering

Language sorting in initial (when booting live cd) language selection puts lower cased languages in the end while language selection during installation does not.

Initial language selection:

Language selection during installing:

edit: Language selection after installation seems to be fine as well.

**To Reproduce**
Steps to reproduce the behavior:
1. Run live cd installer and check list of languages in initial language selection.
2. Run "install elementary os" and check list of languages there.

**Expected behavior**
List is ordered alphabetically regardless of case.

**Desktop (please complete the following information):**
- OS: elementary OS 6

**Additional context**
Having language list sorted regardless of case makes way more sense for me, at first I didn't think that polish was supported at all, which was super weird. It's correct grammatically to have language name lower cased in polish.

Reproduziere das Problem im Live-CD-Installer, indem du die anfängliche Sprachauswahl mit der während der Installation angezeigten Sprachenliste vergleichst. Verfolge die beiden Auswahlansichten und ihr Sortierverhalten; abgeschlossen ist die Aufgabe, wenn beide Listen unabhängig von der Groß-/Kleinschreibung alphabetisch sortiert sind, einschließlich kleingeschriebener Sprachnamen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.