added file dependency check, switched back to english, smaller fix and improvements

lib/services.sh

@@ -15,7 +15,7 @@
 exec_serv()
 {
     if [[ $# -lt 2 ]]; then
-        prnt E "exec_serv(): Erreur de syntaxe !"
+        prnt E "exec_serv(): Syntax error!"
         exit 11
     fi
 
@@ -27,7 +27,7 @@ exec_serv()
                             -e s/%com%/$command/)
     unset svcname command
 
-    prnt I "Lancement de la commande $command du services $svcname"
+    prnt I "Launching command $command for the service $svcname"
     $lineexec
     return $?
     unset lineexec