clarify text that pump needs to be working

(see streetcomplete#3053 (comment))

app/src/main/res/values/strings.xml

@@ -654,7 +654,7 @@ However, before uploading your changes, the app checks with a <a href=\"https
     <string name="quest_bikeParkingCapacity_title">"How many bikes can be parked here?"</string>
     <string name="quest_bikeParkingCapacity_hint">"Note that most normal stands can be used from both sides to park each one bike."</string>
 
-    <string name="quest_air_pump_bicycle_title">"Is there a bicycle air pump available to general public?"</string>
+    <string name="quest_air_pump_bicycle_title">"Is there a working bicycle air pump available to general public?"</string>
     <string name="quest_air_pump_compressor_title">"Is there an air compressor available here?"</string>
 
     <string name="quest_board_type_title">What’s the topic of this information board?</string>