client: rename the "System" theme to "Auto"

src/public/app/widgets/type_widgets/options/appearance/theme.js

@@ -71,7 +71,7 @@ export default class ThemeOptions extends OptionsWidget {
             { val: 'next', title: t("theme.triliumnext") },
             { val: 'next-light', title: t("theme.triliumnext-light") },
             { val: 'next-dark', title: t("theme.triliumnext-dark") },
-            { val: 'system', title: t('theme.system_theme') },
+            { val: 'auto', title: t('theme.auto_theme') },
             { val: 'light', title: t('theme.light_theme') },
             { val: 'dark', title: t('theme.dark_theme') }
         ].concat(await server.get('options/user-themes'));

src/public/translations/en/translation.json

@@ -1072,7 +1072,7 @@
     "title": "Application Theme",
     "theme_label": "Theme",
     "override_theme_fonts_label": "Override theme fonts",
-    "system_theme": "System",
+    "auto_theme": "Auto",
     "light_theme": "Light",
     "dark_theme": "Dark",
     "triliumnext": "TriliumNext Beta (Follow system color scheme)",

src/routes/index.ts

@@ -61,7 +61,7 @@ function index(req: Request, res: Response) {
 }
 
 function getThemeCssUrl(theme: string, themeNote: BNote | null) {
-    if (theme === 'system') {
+    if (theme === 'auto') {
         return `${assetPath}/stylesheets/theme.css`;
     } else if (theme === 'light') {
         // light theme is always loaded as baseline