use amenity=dancing_school for Dance Studio, add field for dance:teaching

closes #373, see also #814

data/fields/dance/teaching.json

@@ -0,0 +1,5 @@
+{
+    "key": "dance:teaching",
+    "type": "check",
+    "label": "Offers Dance Lessons"
+}

data/presets/leisure/dance.json

@@ -6,7 +6,8 @@
         "address",
         "building_area_yes",
         "opening_hours",
-        "dance/style"
+        "dance/style",
+        "dance/teaching"
     ],
     "moreFields": [
         "email",

data/presets/leisure/dancing_school.json

@@ -29,12 +29,10 @@
         "dance teaching"
     ],
     "tags": {
-        "leisure": "dance",
-        "dance:teaching": "yes"
+        "amenity": "dancing_school"
     },
-    "reference": {
-        "key": "leisure",
-        "value": "dance"
-    },
-    "name": "Dance School"
+    "name": "Dance School",
+    "aliases": [
+        "Dance Studio"
+    ]
 }

interim/source_strings.yaml

@@ -1440,6 +1440,9 @@ en:
       dance/style:
         # dance:style=*
         label: Dance Styles
+      dance/teaching:
+        # dance:teaching=*
+        label: Offers Dance Lessons
       date:
         # date=*
         label: Date
@@ -8858,7 +8861,7 @@ en:
         # 'terms: ballroom,jive,swing,tango,waltz'
         terms: <translate with synonyms or related terms for 'Dance Hall', separated by commas>
       leisure/dancing_school:
-        # leisure=dance + dance:teaching=yes | Translate the primary name. Optionally, add equivalent synonyms on newlines in order of preference (press the Return key).
+        # amenity=dancing_school | Dance Studio | Translate the primary name. Optionally, add equivalent synonyms on newlines in order of preference (press the Return key).
         name: Dance School
         # 'terms: jive,swing,tango,waltz,dance teaching'
         terms: <translate with synonyms or related terms for 'Dance School', separated by commas>