Update references to mastery in en_us for Mining to Mother Lode

Changelog.txt

@@ -20,9 +20,9 @@ Version 2.1.175
     Added 'mcmmo.ability.taming.mastery' permission node
     Added 'mcmmo.ability.unarmed.mastery' permission node
     Added 'mcmmo.ability.woodcutting.mastery' permission node
-    Added 'Mining.SubSkill.Mastery.Name' to locale
-    Added 'Mining.SubSkill.Mastery.Stat' to locale
-    Added 'Mining.SubSkill.Mastery.Description' to locale
+    Added 'Mining.SubSkill.MotherLode.Name' to locale
+    Added 'Mining.SubSkill.MotherLode.Stat' to locale
+    Added 'Mining.SubSkill.MotherLode.Description' to locale
     Added 'Woodcutting.SubSkill.Mastery.Name' to locale
     Added 'Woodcutting.SubSkill.Mastery.Stat' to locale
     Added 'Woodcutting.SubSkill.Mastery.Description' to locale

src/main/resources/locale/locale_en_US.properties

@@ -312,9 +312,9 @@ Mining.SubSkill.SuperBreaker.Stat=Super Breaker Length
 Mining.SubSkill.DoubleDrops.Name=Double Drops
 Mining.SubSkill.DoubleDrops.Description=Double the normal loot
 Mining.SubSkill.DoubleDrops.Stat=Double Drop Chance
-Mining.SubSkill.Mastery.Name=Mother Lode
-Mining.SubSkill.Mastery.Description=Triple the normal loot
-Mining.SubSkill.Mastery.Stat=Mother Lode Chance
+Mining.SubSkill.MotherLode.Name=Mother Lode
+Mining.SubSkill.MotherLode.Description=Triple the normal loot
+Mining.SubSkill.MotherLode.Stat=Mother Lode Chance
 Mining.SubSkill.BlastMining.Name=Blast Mining
 Mining.SubSkill.BlastMining.Description=Bonuses to mining with TNT
 Mining.SubSkill.BlastMining.Stat=Blast Mining:&a Rank {0}/{1} &7({2})