Added the functionality

Author: tanvidadu

app/src/main/java/fr/free/nrw/commons/AboutActivity.java

@@ -126,6 +126,7 @@ public void launchTranslate(View view) {
                     public void onClick(DialogInterface dialog, int which) {
                         String languageSelected = spinner.getSelectedItem().toString();
                         TokensTranslations tokensTranslations = new TokensTranslations();
+                        tokensTranslations.initailize();
                         String token = tokensTranslations.getTranslationToken(languageSelected);
                         Utils.handleWebUrl(AboutActivity.this,Uri.parse("https://translatewiki.net/w/i.php?title=Special:Translate&language="+token+"&group=commons-android-strings&filter=%21translated&action=translate ?"));
                     }

app/src/main/java/fr/free/nrw/commons/TokensTranslations.java

@@ -7,9 +7,9 @@
  */
 
 public class TokensTranslations {
-    private static HashMap<String,String> translationToken;
+     HashMap<String,String> translationToken = new HashMap<String,String>();
 
-    TokensTranslations() {
+      public void initailize() {
         translationToken.put("Kazakh", "ab");
         translationToken.put("Afrikaans", "af");
         translationToken.put("Arabic", "ar");