Max Height: Ask what is indicated

While it is fine to tag maxheight also when it is not signed, there is already a follow-up quest that asks for the physical height if it is not signed. This makes sense for two reasons:
1. It remains quick and easy to answer the quest by clarifying that it is not necessary to measure it if the height is not indicated anywhere
2. It removes the possibility that someone does something possibly stupid: Measure the height of overhead wire

See https://community.openstreetmap.org/t/streetcomplete-fragt-bei-eisenbahn-weg-kreuzung-nach-durchfahrtshohe/103606

app/src/main/java/de/westnordost/streetcomplete/quests/max_height/AddMaxHeight.kt

@@ -79,8 +79,8 @@ class AddMaxHeight : OsmElementQuestType<MaxHeightAnswer> {
             && tags["railway"] != "level_crossing"
         // only the "below the bridge" situation may need some context
         return when {
-            isBelowBridge -> R.string.quest_maxheight_below_bridge_title
-            else          -> R.string.quest_maxheight_title
+            isBelowBridge -> R.string.quest_maxheight_sign_below_bridge_title
+            else          -> R.string.quest_maxheight_sign_title
         }
     }
 

app/src/main/java/de/westnordost/streetcomplete/quests/max_height/AddMaxPhysicalHeight.kt

@@ -26,6 +26,9 @@ class AddMaxPhysicalHeight(
         and access !~ private|no
         and vehicle !~ private|no
     """.toElementFilterExpression() }
+    // leaving out railway = level_crossing is deliberate, we do not want people to measure overhead
+    // cables by hand - bzzzt! - but also (if measured with laser) the result would be wrong, as
+    // the (signed) max height is always something like 1.5 meter distance to the cable itself
 
     private val wayFilter by lazy { """
         ways with

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

@@ -1083,6 +1083,8 @@ If any lanes are reserved for buses, please leave a note instead."</string>
 
     <string name="quest_maxheight_title">"What’s the height limit here?"</string>
     <string name="quest_maxheight_below_bridge_title">What’s the height limit below the bridge?</string>
+    <string name="quest_maxheight_sign_title">"What height limit is indicated here?"</string>
+    <string name="quest_maxheight_sign_below_bridge_title">What height limit is indicated below the bridge?</string>
     <string name="quest_maxheight_answer_noSign">There is no sign…</string>
     <string name="quest_maxheight_split_way_hint">If it doesn’t apply for the whole way, consider answering “%s”.</string>
     <string name="quest_maxheight_answer_noSign_question">Is there easily enough space for even the tallest trucks (at least about 4.5 meters / 15 feet) to pass through?</string>