Fix some grammar in "Learn a Language" (#704)

src/backend-map.json

@@ -8151,7 +8151,7 @@
                     "y": "931",
                     "properties": {
                         "size": "15",
-                        "text": "Make sure to learn it’s quirks. Core detail about it's"
+                        "text": "Make sure to learn its quirks. Core details about its"
                     }
                 },
                 {
@@ -12242,4 +12242,4 @@
         "measuredH": "3182",
         "version": "1.0"
     }
-}
\ No newline at end of file
+}