Improved docs

po.go

@@ -44,6 +44,8 @@ func (t *translation) getN(n int) string {
 
 /*
 Po parses the content of any PO file and provides all the translation functions needed.
+It's the base object used by all packafe methods. 
+And it's safe for concurrent use by multiple goroutines by using the sync package for write locking. 
 
 Example:
 
@@ -59,6 +61,7 @@ Example:
         // Get translation
         println(po.Get("Translate this"))
     }
+
 */
 type Po struct {
 	// Storage