refactor: fallback to the IDE locale instead of the JVM default locale

This ensures that plugin uses the language set for the IDE.

Closes: #126

Author: lppedd

src/main/kotlin/com/github/lppedd/cc/CCRegistry.kt

@@ -1,5 +1,6 @@
 package com.github.lppedd.cc
 
+import com.intellij.l10n.LocalizationUtil
 import com.intellij.openapi.util.registry.Registry
 import java.util.*
 
@@ -13,9 +14,9 @@ internal object CCRegistry {
   fun getLocale(): Locale {
     val value = Registry.get(CC.Registry.Locale)
     return when (value.selectedOption) {
-      "English (en_US)" -> Locale.ENGLISH
-      "Chinese (zh_CN)" -> Locale.SIMPLIFIED_CHINESE
-      else -> Locale.getDefault()
+      "English" -> Locale.ROOT
+      "Chinese (Simplified)" -> Locale.SIMPLIFIED_CHINESE
+      else -> LocalizationUtil.getLocale()
     }
   }
 

src/main/resources/META-INF/plugin.xml

@@ -103,7 +103,7 @@
     <registryKey
         key="com.github.lppedd.cc.locale"
         description="Set the UI locale"
-        defaultValue="[Default*|English (en_US)|Chinese (zh_CN)]"
+        defaultValue="[Default*|English|Chinese (Simplified)]"
     />
     <registryKey
         key="com.github.lppedd.cc.providers.vcs"