Fixed String encoding

client/app/src/main/java/customUI/Converter.java

@@ -0,0 +1,20 @@
+package customUI;
+
+public class Converter {
+    /*
+    Ä, ä 		\u00c4, \u00e4
+    Ö, ö 		\u00d6, \u00f6
+    Ü, ü 		\u00dc, \u00fc
+    ß 		    \u00df
+     */
+    public static String CONVERT_STR(String str){
+        return str
+                .replace("ä", "\u00e4")
+                .replace("Ä", "\u00c4")
+                .replace("ö", "\u00f6")
+                .replace("Ö", "\u00d6")
+                .replace("ü", "\u00fc")
+                .replace("Ü", "\u00dc")
+                .replace("ß", "\u00df");
+    }
+}