Add textdomain to achievements files.

data/campaigns/Dead_Water/achievements.cfg

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+#textdomain wesnoth-dw
+

data/campaigns/Delfadors_Memoirs/achievements.cfg

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+#textdomain wesnoth-dm
+

data/campaigns/Descent_Into_Darkness/achievements.cfg

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+#textdomain wesnoth-did
 [achievement_group]
     display_name=_"Descent into Darkness"
     content_for=descent_into_darkness

data/campaigns/Eastern_Invasion/achievements.cfg

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+#textdomain wesnoth-ei
+

data/campaigns/Heir_To_The_Throne/achievements.cfg

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+#textdomain wesnoth-httt
+

data/campaigns/Legend_of_Wesmere/achievements.cfg

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+#textdomain wesnoth-low
+

data/campaigns/Liberty/achievements.cfg

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+#textdomain wesnoth-l
+

data/campaigns/Northern_Rebirth/achievements.cfg

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+#textdomain wesnoth-nr
+

data/campaigns/Sceptre_of_Fire/achievements.cfg

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+#textdomain wesnoth-sof
+

data/campaigns/Secrets_of_the_Ancients/achievements.cfg

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+#textdomain wesnoth-sota
+

data/campaigns/Son_Of_The_Black_Eye/achievements.cfg

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+#textdomain wesnoth-sotbe
+

data/campaigns/The_Hammer_of_Thursagan/achievements.cfg

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+#textdomain wesnoth-thot
+

data/campaigns/The_Rise_Of_Wesnoth/achievements.cfg

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+#textdomain wesnoth-trow
+

data/campaigns/The_South_Guard/achievements.cfg

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+#textdomain wesnoth-tsg
+

data/campaigns/Two_Brothers/achievements.cfg

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+#textdomain wesnoth-tb
+

data/campaigns/Under_the_Burning_Suns/achievements.cfg

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+#textdomain wesnoth-utbs
+

data/campaigns/Winds_of_Fate/achievements.cfg

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+#textdomain wesnoth-wof
+

data/campaigns/World_Conquest/achievements.cfg

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+#textdomain wesnoth-wc
+

data/campaigns/tutorial/achievements.cfg

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+#textdomain wesnoth-tutorial
 [achievement_group]
     display_name=_"Tutorial"
     content_for=tutorial