Fix date format of some Asian languages (#1928)

With DateFormat.getBestDateTimePattern to generate best
localized pattern.

Signed-off-by: Yihong Gao <yihong.ui@gmail.com>

CHANGES.md

@@ -10,6 +10,7 @@ Improvements 🙌:
  - Ensure users do not accidentally ignore other users (#1890)
 
 Bugfix 🐛:
+ - Fix incorrect date format for some Asian languages (#1928)
  - Fix invisible toolbar (Status.im theme) (#1746)
  - Fix relative date time formatting (#822)
  - Fix crash reported by RageShake

vector/src/main/java/im/vector/app/core/date/VectorDateFormatter.kt

@@ -17,6 +17,7 @@
 package im.vector.app.core.date
 
 import android.content.Context
+import android.text.format.DateFormat
 import android.text.format.DateUtils
 import im.vector.app.core.resources.LocaleProvider
 import org.threeten.bp.LocalDateTime
@@ -45,8 +46,9 @@ class VectorDateFormatter @Inject constructor(private val context: Context,
     private val messageHourFormatter by lazy {
         DateTimeFormatter.ofPattern("H:mm", localeProvider.current())
     }
+
     private val messageDayFormatter by lazy {
-        DateTimeFormatter.ofPattern("EEE d MMM", localeProvider.current())
+        DateTimeFormatter.ofPattern(DateFormat.getBestDateTimePattern(localeProvider.current(), "EEE d MMM"))
     }
 
     fun formatMessageHour(localDateTime: LocalDateTime): String {