Fix unsupported unicode characters in two styles

`journal-of-the-marine-biological-association-of-the-united-kingdom.csl`

- From PR citation-style-language#2547, it looks like the original style was cloned from
  `apa-6th-edition.csl`. The invalid character in `number-of-volumes`
  was updated to match that journal: `–`.

`museum-national-dhistoire-naturelle.csl`

- Overwhelmingly, styles use the following within the `genre` macro:
  ```
  <text variable="number" prefix=" No. "/>
  ```
  Only styles with default locale `de-DE` sometimes use ` Nr. `.

Fixes citation-style-language#7222

journal-of-the-marine-biological-association-of-the-united-kingdom.csl

@@ -438,7 +438,7 @@
             <else>
               <group>
                 <text term="volume" form="short" plural="true" text-case="capitalize-first" suffix=" "/>
-                <number variable="number-of-volumes" form="numeric" prefix="1�"/>
+                <number variable="number-of-volumes" form="numeric" prefix="1&#8211;"/>
               </group>
             </else>
           </choose>

museum-national-dhistoire-naturelle.csl

@@ -192,7 +192,7 @@
   <macro name="genre">
     <group prefix=" " suffix=". ">
       <text variable="genre"/>
-      <text variable="number" prefix=" N�"/>
+      <text variable="number" prefix=" No. "/>
     </group>
   </macro>
   <macro name="event">