Split out settings view and made functional

- Split settings out to new views using a core shared layout.
- Extracted added language text to translation files.
- Updated settings routes to be dynamic to category.
- Added redirect for old primary settings route.
- Updated existing tests to cover settings route changes.
- Added tests to cover settings view.
- Improved contrast of settings links for dark mode.

tests/Auth/AuthTest.php

@@ -202,7 +202,7 @@ class AuthTest extends TestCase
     {
         $this->assertFalse(setting('registration-role'));
 
-        $resp = $this->asAdmin()->get('/settings');
+        $resp = $this->asAdmin()->get('/settings/registration');
         $resp->assertElementContains('select[name="setting-registration-role"] option[value="0"][selected]', '-- None --');
     }