Remove some not needed translatable strings.

Make other strings like the currently used strings.

data/gui/default.cfg

@@ -5,7 +5,7 @@
 
 [gui]
 	id = "default"
-	description = _ "Default"
+	description = "Default"
 
 {gui/default/macros.cfg}
 {gui/default/window/}

data/gui/default/window/addon.cfg

@@ -5,7 +5,7 @@
 
 [window]
 	id = "addon_connect"
-	description = _ "addon server connection dialog"
+	description = "Addon server connection dialog."
 
 	[resolution]
 		top = "center"
@@ -80,7 +80,7 @@
 								[label]
 									definition = "default"
 
-									label = _ "name :"
+									label = _ "Server:"
 								[/label]
 
 							[/column]
@@ -97,7 +97,7 @@
 									definition = "default"
 									history = "addon_connect_history"
 
-									size_text = _ "very long text which might need to fit"
+									size_text = "very long text which might need to fit"
 									label = ""
 								[/text_box]
 
@@ -147,8 +147,8 @@
 
 									help = "With this feature you can remove locally installed addons, after doing so you need to restart Wesnoth."
 
-									size_text = _ "manage addons"
-									label = _ "manage addons"
+									size_text = _ "Remove Add-ons"
+									label = _ "Remove Add-ons"
 
 									# we define the return value manually instead of being
 									# linked to the id. Not sure whether that's the best
@@ -172,8 +172,8 @@
 									id = "ok"
 									definition = "default"
 
-									size_text = _ "connect"
-									label = _ "connect"
+									size_text = _ "Connect"
+									label = _ "Connect"
 								[/button]
 
 							[/column]
@@ -187,7 +187,7 @@
 									id = "cancel"
 									definition = "default"
 
-									label = _ "cancel"
+									label = _ "Cancel"
 								[/button]
 
 							[/column]