i18n(locales): 为多语言添加自定义选项

- 在所有语言的选项列表中新增“Custom”条目
- 保持了现有条目的顺序和格式一致
- 涉及语言包括德语、英语、西班牙语、法语、中文及繁体中文版本

client/src/locales/data-de.json

@@ -109,7 +109,8 @@
       "options": [
         "BS2B Standard (700 Hz, 4,5 dB)",
         "BS2B Populär (700 Hz, 6 dB)",
-        "BS2B Entspannt (650 Hz, 9,5 dB)"
+        "BS2B Entspannt (650 Hz, 9,5 dB)",
+        "Custom"
       ]
     },
     "hearing": {

client/src/locales/data-en.json

@@ -109,7 +109,8 @@
       "options": [
         "BS2B default (700 Hz, 4.5 dB)",
         "BS2B popular (700 Hz, 6 dB)",
-        "BS2B relax (650 Hz, 9.5 dB)"
+        "BS2B relax (650 Hz, 9.5 dB)",
+        "Custom"
       ]
     },
     "hearing": {

client/src/locales/data-es.json

@@ -109,7 +109,8 @@
       "options": [
         "BS2B predeterminado (700 Hz, 4,5 dB)",
         "BS2B popular (700 Hz, 6 dB)",
-        "BS2B relajado (650 Hz, 9,5 dB)"
+        "BS2B relajado (650 Hz, 9,5 dB)",
+        "Custom"
       ]
     },
     "hearing": {

client/src/locales/data-fr.json

@@ -109,7 +109,8 @@
       "options": [
         "BS2B défaut (700 Hz, 4,5 dB)",
         "BS2B populaire (700 Hz, 6 dB)",
-        "BS2B relax (650 Hz, 9,5 dB)"
+        "BS2B relax (650 Hz, 9,5 dB)",
+        "Custom"
       ]
     },
     "hearing": {

client/src/locales/data-zh-HK.json

@@ -102,7 +102,8 @@
       "options": [
         "BS2B default(700Hz,4.5dB)",
         "BS2B polular(700Hz,6dB)",
-        "BS2B relax(650Hz,9.5dB)"
+        "BS2B relax(650Hz,9.5dB)",
+        "Custom"
       ]
     },
     "hearing": {

client/src/locales/data-zh.json

@@ -102,7 +102,8 @@
       "options": [
         "BS2B default(700Hz,4.5dB)",
         "BS2B polular(700Hz,6dB)",
-        "BS2B relax(650Hz,9.5dB)"
+        "BS2B relax(650Hz,9.5dB)",
+        "Custom"
       ]
     },
     "hearing": {