PartyMode Challenge: Added an option to not refill jokers after every song

Players can now choose between refilling the jokers every song and save
the amount of jokers (e.g. 5 Jokers per Player for the whole PartyMode).

Output/PartyModes/Challenge/Languages/English.xml

@@ -16,6 +16,7 @@
   <string name="TR_SCREENCONFIG_NUMMICS">Number of mics</string>
   <string name="TR_SCREENCONFIG_NUMROUNDS">Number of rounds</string>
   <string name="TR_SCREENCONFIG_NUMJOKERS">Number of jokers</string>
+  <string name="TR_SCREENCONFIG_REFILLJOKERS">Refill jokers every round</string>
   <string name="TR_SCREENNAMES_TITLE">Challenge Mode: Choose Player</string>
   <string name="TR_SCREENNAMES_BUTTON_RANDOM">Select random</string>
   <string name="TR_SCREENMAIN_TITLE">Challenge Mode: Overview</string>