title: dynamically set currency symbol
body: <p>In my app there are a lot of textviews which contain a currency symbol.</p>
  
  <p>Now I want the user to set the symbol. I created a sharedpreference and added there all the existing currencies. Unfortunatelly there are approximately 20 different currencies out there.</p>
  
  <p>Therefor I am struggling how to change dynamically the currency symbol in all my textviews.
  I could create for each a big switch case statement (with 20 cases) but this will blow up my code extremly. </p>
  
  <p>Is there another technique how I can change the symbol. E.g. with help of an xml file like the different languages...</p>