Remove some unused translations

lib/app_sources/steammobile.dart

@@ -8,7 +8,7 @@ import 'package:obtainium/providers/source_provider.dart';
 class SteamMobile extends AppSource {
   SteamMobile() {
     hosts = ['store.steampowered.com'];
-    name = tr('steam');
+    name = 'Steam';
     additionalSourceAppSpecificSettingFormItems = [
       [
         GeneratedFormDropdown('app', apks.entries.toList(),

lib/pages/apps.dart

@@ -877,8 +877,7 @@ class AppsPageState extends State<AppsPage> {
                           }
                           urls = urls.substring(0, urls.length - 1);
                           Share.share(urls,
-                              subject:
-                                  '${tr('obtainium')} - ${tr('appsString')}');
+                              subject: 'Obtainium - ${tr('appsString')}');
                           Navigator.of(context).pop();
                         },
                         tooltip: tr('shareSelectedAppURLs'),
@@ -906,8 +905,7 @@ class AppsPageState extends State<AppsPage> {
                                 urls +=
                                     '</ul>\n\n<p><a href="$obtainiumUrl">${tr('about')}</a></p>';
                                 Share.share(urls,
-                                    subject:
-                                        '${tr('obtainium')} - ${tr('appsString')}');
+                                    subject: 'Obtainium - ${tr('appsString')}');
                               },
                         tooltip: tr('shareAppConfigLinks'),
                         icon: const Icon(Icons.ios_share),

lib/pages/settings.dart

@@ -38,9 +38,9 @@ class _SettingsPageState extends State<SettingsPage> {
             value: InstallMethodSettings.normal,
             child: Text(tr('normal')),
           ),
-          DropdownMenuItem(
+          const DropdownMenuItem(
             value: InstallMethodSettings.shizuku,
-            child: Text(tr('shizuku')),
+            child: Text('Shizuku'),
           ),
           DropdownMenuItem(
             value: InstallMethodSettings.root,
@@ -79,14 +79,14 @@ class _SettingsPageState extends State<SettingsPage> {
     var colourDropdown = DropdownButtonFormField(
         decoration: InputDecoration(labelText: tr('colour')),
         value: settingsProvider.colour,
-        items: [
+        items: const [
           DropdownMenuItem(
             value: ColourSettings.basic,
-            child: Text(tr('obtainium')),
+            child: Text('Obtainium'),
           ),
           DropdownMenuItem(
             value: ColourSettings.materialYou,
-            child: Text(tr('materialYou')),
+            child: Text('Material You'),
           )
         ],
         onChanged: (value) {