localization: remove the string "(experimental)" & and update

Change-Id: I9bf784d65e63143d71684a71849c94d3ac6fe19f
diff --git a/ui/pl.lproj/RingWizardNewAccount.strings b/ui/pl.lproj/RingWizardNewAccount.strings
index 03adaef..5335c57 100644
--- a/ui/pl.lproj/RingWizardNewAccount.strings
+++ b/ui/pl.lproj/RingWizardNewAccount.strings
@@ -5,8 +5,8 @@
 /* Class = "NSTextFieldCell"; placeholderString = "Mandatory*"; ObjectID = "1TO-Ov-S8j"; */
 "1TO-Ov-S8j.placeholderString" = "Obowiązkowe*";
 
-/* Class = "NSButtonCell"; title = "Register public username (experimental)"; ObjectID = "AG5-GR-bii"; */
-"AG5-GR-bii.title" = "Zarejestruj publiczną nazwę użytkownika (eksperymentalne)";
+/* Class = "NSButtonCell"; title = "Register public username"; ObjectID = "AG5-GR-bii"; */
+"AG5-GR-bii.title" = "Register public username";
 
 /* Class = "NSTextFieldCell"; title = "Choose your password"; ObjectID = "B6x-jj-48R"; */
 "B6x-jj-48R.title" = "Wybierz hasło";