Update sync text, theme icons, communities link

Add responsive icons for system theme selection (Smartphone, Tablet, Monitor) in ThemeToggle.vue; add an "Explore Communities" CTA to Home.vue that links to the localized communities page. Reduce the advertised sync update rate from ~100 to ~50 times per second across multiple locale files (en, de, es, it, ru). Also update the English freeroam label/description to "Freeroam & Custom Servers" with details about custom scripts/maps/mods. Note: fr.json contains unresolved merge conflict markers for the sync description and needs manual resolution.

src/views/Home.vue

@@ -277,6 +277,15 @@ const faqs = computed(() => [
             </p>
           </div>
         </div>
+        <div class="text-center mt-8">
+          <RouterLink
+            :to="`/${$i18n.locale}/communities`"
+            class="inline-flex items-center gap-2 bg-beammp-orange hover:bg-beammp-orange/90 text-white px-6 py-3 rounded-lg font-semibold transition-colors"
+          >
+            Explore Communities
+            <Globe class="w-5 h-5" />
+          </RouterLink>
+        </div>
       </div>
     </section>