diff --git a/lib/bin_test.sh b/lib/bin_test.sh
index 26ccbb16..a5dc350d 100644
--- a/lib/bin_test.sh
+++ b/lib/bin_test.sh
@@ -18,8 +18,10 @@ test_mktemp() (
 
 
 test_realpath() (
-  tmp=$(mktemp -d)
+  tmp=${GSH_TMP:?Error: \$GSH_TMP not set}
   cd "$tmp"
+  rm -f a b
+
   touch a
   rpa=$(realpath ./a)
   if [ -z "$rpa" ]
@@ -45,7 +47,7 @@ test_realpath() (
     return 1
   fi
 
-  rm -rf "$tmp"
+  rm -f a b
   return 0
 )
 
diff --git a/missions/finding_files_maze/01_ls_cd/i18n/en.po b/missions/finding_files_maze/01_ls_cd/i18n/en.po
index 93121f22..327a4883 100644
--- a/missions/finding_files_maze/01_ls_cd/i18n/en.po
+++ b/missions/finding_files_maze/01_ls_cd/i18n/en.po
@@ -18,6 +18,7 @@ msgid   "$MISSION_DIR/goal/en.txt"
 msgstr  "$MISSION_DIR/goal/en.txt"
 
 # path for the text file containing the treasure message
+#, sh-format
 msgid   "$MISSION_DIR/treasure-msg/en.txt"
 msgstr  "$MISSION_DIR/treasure-msg/en.txt"
 
diff --git a/missions/finding_files_maze/01_ls_cd/i18n/fr.po b/missions/finding_files_maze/01_ls_cd/i18n/fr.po
index 6d54cf05..075ef8ac 100644
--- a/missions/finding_files_maze/01_ls_cd/i18n/fr.po
+++ b/missions/finding_files_maze/01_ls_cd/i18n/fr.po
@@ -17,6 +17,7 @@ msgid   "$MISSION_DIR/goal/en.txt"
 msgstr  "$MISSION_DIR/goal/fr.txt"
 
 # path for the text file containing the goal
+#, sh-format
 msgid   "$MISSION_DIR/treasure-msg/en.txt"
 msgstr  "$MISSION_DIR/goal/fr.txt"
 
diff --git a/missions/finding_files_maze/01_ls_cd/i18n/template.pot b/missions/finding_files_maze/01_ls_cd/i18n/template.pot
index 3f00d52a..8807d1f9 100644
--- a/missions/finding_files_maze/01_ls_cd/i18n/template.pot
+++ b/missions/finding_files_maze/01_ls_cd/i18n/template.pot
@@ -17,6 +17,7 @@ msgid   "$MISSION_DIR/goal/en.txt"
 msgstr  ""
 
 # path for the text file containing the treasure message
+#, sh-format
 msgid   "$MISSION_DIR/treasure-msg/en.txt"
 msgstr  ""