Update locale files for English, Traditional Chinese, and Simplified Chinese to include new effect titles and crossfeed options; refactor EffectsPage to utilize localized labels and improve state management for audio effects.

client/src/locales/data-en.json

@@ -36,6 +36,9 @@
     }
   },
   "effect": {
+    "pageTitle": "Effects",
+    "selectStyleTitle": "Select sound style",
+    "selectCrossfeedTitle": "Select crossfeed preset",
     "lowBass": "Bass",
     "enterBass": "Mid",
     "highBass": "Treble",
@@ -47,7 +50,7 @@
     "mainframeCase": "Main speaker",
     "subwooferUnit": "Subwoofer",
     "style": {
-      "label": "style",
+      "label": "Style",
       "options": [
         {
           "index": 0,
@@ -119,7 +122,12 @@
       "label": "Stereo width"
     },
     "crossfeed": {
-      "label": "Crossfeed"
+      "label": "Crossfeed",
+      "options": [
+        "BS2B default (700 Hz, 4.5 dB)",
+        "BS2B popular (700 Hz, 6 dB)",
+        "BS2B relax (650 Hz, 9.5 dB)"
+      ]
     },
     "subwoofer": {
       "label": "Subwoofer",
@@ -145,7 +153,7 @@
     "Standard": "Standard equalizer preset",
     "edit": "Batch Edit",
     "headset": "Add HeadSet",
-    "preamp": "Total gain",
+    "preamp": "Preamp",
     "filters": {
       "label": "Filters",
       "options": [