content(messen): shorten fair names to Windenergietage and Intersolar

The location already appears in its own field, so repeating it in the
name is redundant. Use "Windenergietage" and "Intersolar" in DE, and
"Wind Energy Days" and "Intersolar" in EN.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

content/de/messen.mdx

@@ -21,8 +21,8 @@ layout: "fullBleed"
     showJobs={false} 
     fairs={[
       { name: 'Werkstatt Kabel 2026', date: '24. - 25. November 2026', type: 'Fachtagung', location: 'Wiesbaden', url: 'https://werkstatt-kabel.essociation.de/' },
-      { name: 'Intersolar München', date: '8. - 10. Juni 2027', type: 'Messe', location: 'München', url: 'https://www.intersolar.de/' },
-      { name: 'Windenergietage Potsdam', date: '09. - 11. November 2027', type: 'Fachkongress', location: 'Potsdam', url: 'https://www.windenergietage.de/' }
+      { name: 'Intersolar', date: '8. - 10. Juni 2027', type: 'Messe', location: 'München', url: 'https://www.intersolar.de/' },
+      { name: 'Windenergietage', date: '09. - 11. November 2027', type: 'Fachkongress', location: 'Potsdam', url: 'https://www.windenergietage.de/' }
     ]}
   />
 </div>