Fix some spelling issues

Fix a typo in micro_ai simple_attack demo: you -> your.
Fix inconsistent spaces
Fix misspelled wesnoth in systemd unit file

data/ai/micro_ais/scenarios/simple_attack.cfg

@@ -173,7 +173,7 @@
         [/message]
         [message]
             speaker=Uralt
-            message= _ "Hahahahaha !! I have given special instruction to my Soulless to attack all you almost-advanced units first. Also watch how those same Soulless will throw themselves mercilessly at your pitiful soldiers after that, saving my more valuable skeleton minions for later.  I have taken the term 'disposable units' to a whole new level. Watch in awe !!
+            message= _ "Hahahahaha!! I have given special instruction to my Soulless to attack all your almost-advanced units first. Also watch how those same Soulless will throw themselves mercilessly at your pitiful soldiers after that, saving my more valuable skeleton minions for later. I have taken the term 'disposable units' to a whole new level. Watch in awe!!
 
 <i>Translation: The undead side includes two instances of the Simple Attack Micro AI.  The first makes the Soulless attack all units 1 XP from leveling up, such that they can be eliminated afterward.  The second executes all remaining attacks possible by Soulless (and Walking Corpses), without regard for their own safety.  Only after that does the default Wesnoth attack mechanism kick in to attack with the remaining units (skeletons).</i>"
         [/message]

data/gui/window/depcheck_select_new.cfg

@@ -1,6 +1,6 @@
 #textdomain wesnoth-lib
 ###
-### Proposes a list of compaitble components if the currently selected
+### Proposes a list of compatible components if the currently selected
 ### one is incompatible. Currently used for scenarios and eras.
 ###
 

packaging/systemd/wesnothd.service.in

@@ -13,7 +13,7 @@ ExecStartPre=/bin/rm -f @FIFO_DIR@/socket
 
 ExecStart=@CMAKE_INSTALL_FULL_BINDIR@/wesnothd@BINARY_SUFFIX@ -t 2 -T 5
 # You can use -c to specify the same configuration file
-# which is used when starting wensothd from within the wesnoth UI
+# which is used when starting wesnothd from within the wesnoth UI
 # e.g. -c /home/user/.local/share/wesnoth/1.14/lan_server.cfg
 # (and make sure wesnothd has the required access permissions)