chore: fix translations test

missing-translations.sh

@@ -20,7 +20,7 @@ for msgFile (${msgFiles}); do
     fi
 done
 
-difference=false
+difference=0
 
 for msgDirectory (${msgDirectories}); do
     typeset -a dirMsgFiles
@@ -50,7 +50,9 @@ for msgDirectory (${msgDirectories}); do
 
 	printf ">>> %s\n" ${msgDirectory}
 	diff --suppress-common-lines -wB ${diffArgs}
-    ) || difference=true
+    ) || difference=1
 done
 
-$difference && exit 1
+if [[ $difference -ne 0 ]]; then
+    exit 1
+fi