Fix up en_GB translation of wesnoth domain.

Remove or change some garbled key strings.

data/hardwired/tips.cfg

@@ -105,11 +105,11 @@
 [/tip]
 [tip]
     text= _ "Patience is often key. Rather than attacking in bad conditions or with few troops, wait for better conditions and then attack."
-    source= _ "- King Konrad, 536YW"
+    source= _ "- The Wesnoth Tactical Guide"
 [/tip]
 [tip]
     text= _ "If you are attacked from several directions, it may be a good idea to send expendable units in some directions to delay enemy units."
-    source= _ "- King Konrad, 552YW"
+    source= _ "- The Wesnoth Tactical Guide"
 [/tip]
 [tip]
     text= _ "Do not be afraid to retreat and regroup; it is often the key to victory."
@@ -208,4 +208,4 @@
     text= _ "In many campaign scenarios, you may issue simple instructions for your computer-controlled allies using the right-click context menu."
     source= _ "- The Wesnoth Tactical Guide"
 [/tip]
-#endif
+#endif

src/actions.cpp

@@ -270,7 +270,7 @@ battle_context::battle_context(const gamemap& map, const std::vector<team>& team
 
 	if (attacker_weapon == -1) {
 		VALIDATE(defender_weapon == -1,
-				_("An invalid weapon is send, possibly due to the Python AI."));
+				_("An invalid weapon is selected, possibly by the Python AI."));
 
 		attacker_weapon = choose_attacker_weapon(attacker, defender, map, teams, units,
 				status, attacker_loc, defender_loc,