finished the mechanism for setting the language

levels/en_EN/files/files-add

@@ -0,0 +1,32 @@
+title = Interior design
+cards = file-new file-delete
+
+[description]
+
+Now that your room looks tidy, you can start to unpack your stuff. You brought two new pieces of furniture with you and with a bright smile,
+you see that their colors match the color of your bed!
+
+Build up your two pieces of furniture by playing the touch card.
+Then name your furniture - you can choose whatever you like.
+
+Make sure the colors match! You can find the bed's color in its description.
+Don't forget to add a color and description to your new furnitures, too!
+
+[setup]
+
+echo A yellow cozy bed. > bed
+
+[win]
+
+# Add two more pieces of furniture
+NUM_FILES="$(ls | wc -l)"
+test "$NUM_FILES" -ge 3
+
+# Make sure the colors match your bed's color.
+NUM_FILES="$(ls | wc -l)"
+YELLOW_FILES="$(grep -li yellow * | wc -l)"
+test "$NUM_FILES" -ge 2 && test "$YELLOW_FILES" = "$NUM_FILES"
+
+[congrats]
+
+Don't you immediately feel more at home?

levels/en_EN/files/files-delete

@@ -0,0 +1,36 @@
+title = Unexpected Roommates
+cards = file-delete
+
+[description]
+
+The first day at Time Travel School comes to an end and you receive the key to your room.
+Full of excitement you open the door just to find... spider webs! Spider webs everywhere!
+
+Remove all the spider webs you can find with the remove card!
+
+[cli]
+
+On the command line, you can easily delete all files ending in -web using this command:
+
+    rm *web
+
+[setup]
+
+echo A tiny spider web is next to your window. > tiny_web
+echo A big spider web sticks above your bed. > big_web
+echo A cozy bed. > bed
+echo An extra thick spider web is right beside your door. > thick_web
+
+[win]
+
+# Remove all spider webs.
+! ls | grep thick_web &&
+! ls | grep big_web &&
+! ls | grep tiny_web
+
+# But make sure you keep your bed!
+ls | grep bed
+
+[congrats]
+
+Your room looks now very tidy and cozy! Time to unpack your stuff!

levels/en_EN/files/sequence

@@ -0,0 +1,3 @@
+files-delete
+files-add
+