style(hud): sentence case als prompts del slot inactiu

data/locale/ca.yaml

@@ -41,10 +41,10 @@ hud:
   # Prompts mostrats al bloc d'un slot inactiu (en lloc dels zeros)
   # quan un jugador encara no ha pulsat START o ha esgotat vides.
   # Dues línies per fer-los caber al bloc lateral (~106 px).
-  join_prompt_can_join_l1: "POLSA START"
+  join_prompt_can_join_l1: "Polsa start"
-  join_prompt_can_join_l2: "PER JUGAR"
+  join_prompt_can_join_l2: "per jugar"
-  join_prompt_wait_l1: "ESPERA"
+  join_prompt_wait_l1: "Espera"
-  join_prompt_wait_l2: "PER JUGAR"
+  join_prompt_wait_l2: "per jugar"
 
 # Textos de l'escena TITLE.
 title:

data/locale/en.yaml

@@ -41,10 +41,10 @@ hud:
   # Prompts shown in an inactive slot's block (instead of zeros) while
   # a player hasn't pressed START yet or has run out of lives. Two
   # short lines so they fit in the side block (~106 px wide).
-  join_prompt_can_join_l1: "PRESS START"
+  join_prompt_can_join_l1: "Press start"
-  join_prompt_can_join_l2: "TO PLAY"
+  join_prompt_can_join_l2: "to play"
-  join_prompt_wait_l1: "PLEASE"
+  join_prompt_wait_l1: "Please"
-  join_prompt_wait_l2: "WAIT"
+  join_prompt_wait_l2: "wait"
 
 # Texts of the TITLE scene.
 title: