Add Vietnamese to language list

README.md

@@ -22,7 +22,7 @@ Install [openScale-dev-build.apk](https://github.com/oliexdev/openScale/releases
 - Estimates body metrics (body fat, body water and lean body mass) based on scientic publications
 - Support for multiple users
 - Partial or full support for custom made Bluetooth scale, Xiaomi Mi scale v1/v2, Sanitas SBF70, Medisana BS444/BS440, Digoo DG-S038H, Yunmai Mini, Excelvan CF369BLE/CF366BLE, Yunmai SE, MGB, Exingtech Y1, Beurer BF700/BF710/BF800, Silvercrest SBF75, Runtastic Libra, Hesley (Yunchen), iHealth HS3, Easy Home 64050, Accuway, Trisa Body Analyze 4.0 (see [openScale wiki](https://github.com/oliexdev/openScale/wiki/Supported-scales-in-openScale) for details)
-- Partially or full translated into Brazilian Portuguese, Catalan, Chinese (traditional), Croatian, Czech, Danish, Dutch, English, French, Galician, German, Greek, Hebrew, Italian, Japanese, Norwegian Bokmål, Polish, Romanian, Russian, Slovak, Slovenian, Spanish, Swedish, Turkish
+- Partially or full translated into Brazilian Portuguese, Catalan, Chinese (traditional), Croatian, Czech, Danish, Dutch, English, French, Galician, German, Greek, Hebrew, Italian, Japanese, Norwegian Bokmål, Polish, Romanian, Russian, Slovak, Slovenian, Spanish, Swedish, Turkish, Vietnamese
 - No advertising and for free
 - All data belongs to you (no cloud service)
 

android_app/app/src/main/res/values/arrays.xml

@@ -28,6 +28,7 @@
         <item>Spanish (Español)</item>
         <item>Swedish (Svenska)</item>
         <item>Turkish (Türkçe)</item>
+        <item>Vietnamese (Tiếng Việt)</item>
     </string-array>
 
     <string-array name="language_values">
@@ -57,6 +58,7 @@
         <item>es</item>
         <item>sv</item>
         <item>tr</item>
+        <item>vi</item>
     </string-array>
 
     <string-array name="theme_entries">