feat: initial support for i18n

ui/src/i18n/en.js

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+import deepmerge from 'deepmerge'
+import englishMessages from 'ra-language-english'
+
+export default deepmerge(englishMessages, {
+  resources: {
+    song: {
+      fields: {
+        albumArtist: 'Album Artist',
+        duration: 'Time',
+        trackNumber: 'Track #'
+      },
+      bulk: {
+        addToQueue: 'Play Later'
+      }
+    },
+    album: {
+      fields: {
+        albumArtist: 'Album Artist',
+        duration: 'Time'
+      }
+    }
+  },
+  ra: {
+    auth: {
+      welcome1: 'Thanks for installing Navidrome!',
+      welcome2: 'To start, create an admin user',
+      confirmPassword: 'Confirm Password',
+      buttonCreateAdmin: 'Create Admin'
+    },
+    validation: {
+      invalidChars: 'Please only use letter and numbers',
+      passwordDoesNotMatch: 'Password does not match'
+    }
+  },
+  menu: {
+    library: 'Library'
+  },
+  player: {
+    panelTitle: 'Play Queue',
+    playModeText: {
+      order: 'In order',
+      orderLoop: 'Repeat',
+      singleLoop: 'Repeat One',
+      shufflePlay: 'Shuffle'
+    }
+  }
+})

ui/src/i18n/index.js

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+import en from './en'
+
+export default { en }