Use `SUPPORTED` file for locale options (#2069)

* Use `SUPPORTED` file for locale options

* Add glibc to `PKGBUILD` depends

PKGBUILD

@@ -16,6 +16,7 @@ depends=(
   'coreutils'
   'cryptsetup'
   'e2fsprogs'
+  'glibc'
   'kbd'
   'pciutils'
   'procps-ng'

archinstall/lib/locale/locale.py

@@ -11,21 +11,14 @@ def list_keyboard_languages() -> Iterator[str]:
 
 
 def list_locales() -> List[str]:
-	with open('/etc/locale.gen', 'r') as fp:
-		locales = []
-		# before the list of locales begins there's an empty line with a '#' in front
-		# so we'll collect the localels from bottom up and halt when we're donw
-		entries = fp.readlines()
-		entries.reverse()
+	locales = []
 
-		for entry in entries:
-			text = entry.replace('#', '').strip()
-			if text == '':
-				break
-			locales.append(text)
+	with open('/usr/share/i18n/SUPPORTED') as file:
+		for line in file:
+			if line != 'C.UTF-8 UTF-8\n':
+				locales.append(line.rstrip())
 
-		locales.reverse()
-		return locales
+	return locales
 
 
 def list_x11_keyboard_languages() -> Iterator[str]: