Never launch new espeak if one is launch; kill one per one espeak, older first

.speak

@@ -1,10 +1,18 @@
 #!/bin/sh
 
 # on teste si la lecture est en cours, pour l'arrêter le cas échéant
-if [ ! -z $(ps -A | grep espeak | awk '{ print $1 }' ) ]
+if ! [ -z "$(ps -A | grep espeak | awk '{ print $1 }' )" ]
 then
-#    kill $(ps -A | grep espeak | awk '{ print $1 }' )
-    killall espeak
+    for k in $(ps -A | grep espeak | awk '{ print $1 }' )
+    do
+	kill $k
+	break
+    done
 else
-    xclip -o | espeak -v $1 | true
+    SPEAK_LANG="FR"
+    if [ -n "$1" ]
+    then
+	SPEAK_LANG="$1"
+    fi
+    xclip -o | espeak -v $SPEAK_LANG | true
 fi