Add capital NULL in fallbacks for non-English languages

Themes/_fallback/Languages/de.ini

@@ -812,7 +812,7 @@ NoLifts=No Lifts
 NoFakes=No Fakes
 None=Nichts
 Normal=Normal
-Null=Null
+NULL=NULL
 Num Songs=Anzahl Songs
 Off=Aus
 Old=Alt

Themes/_fallback/Languages/es.ini

@@ -737,7 +737,7 @@ NoLifts=Sin sueltos
 NoFakes=Sin falsos
 None=Ninguno
 Normal=Normal
-Null=Null
+NULL=NULL
 Num Songs=Núm. canciones
 Off=Desactivado
 Old=Antiguo

Themes/_fallback/Languages/fr.ini

@@ -801,7 +801,7 @@ NoLifts=Lever
 NoFakes=Fausses
 None=Aucun
 Normal=Normal
-Null=Null
+NULL=NULL
 Num Songs=# Chansons
 Off=Off
 Old=Vieux

Themes/_fallback/Languages/ja.ini

@@ -881,7 +881,7 @@ NoLifts=No Lifts
 NoFakes=No Fakes
 None=None
 Normal=Normal
-Null=Null
+NULL=NULL
 Num Songs=Num Songs
 Off=Off
 Old=Old

Themes/_fallback/Languages/nl.ini

@@ -798,7 +798,7 @@ NoRolls=Geen Rollen
 NoStretch=Geen Rekking
 None=Geen
 Normal=Normaal
-Null=Null
+NULL=NULL
 Num Songs=Num Nummers
 Off=Uit
 Old=Oud

Themes/_fallback/Languages/pl.ini

@@ -799,7 +799,7 @@ NoLifts=Bez Liftów
 NoFakes=Bez Podrób
 None=Żaden
 Normal=Normalny
-Null=Null
+NULL=NULL
 Num Songs=Dzwięki Klawisza
 Off=Wyłącz
 Old=Stare

Themes/_fallback/Languages/sk.ini

@@ -815,7 +815,7 @@ NoLifts=Bez liftov
 NoFakes=Bez klamov
 None=Žiadne
 Normal=Normálny
-Null=Null
+NULL=NULL
 Num Songs=Počet skladieb
 Off=Vyp
 Old=Staré

Themes/_fallback/Languages/zh-Hant.ini

@@ -814,7 +814,7 @@ NoLifts=無放開(離鍵)
 NoFakes=無假箭頭
 None=None
 Normal=普通
-Null=Null
+NULL=NULL
 Num Songs=歌曲數
 Off=關
 Old=舊