refactor: globalized current locale, translation improvements

src/components/App/AppFooter.vue

@@ -9,7 +9,9 @@
 
     <br />
     <a href="https://discord.gg/x2mpNN3svk">
-      <img src="/images/icon-discord.png" alt="" />&nbsp;<b>{{ $t('footer.discord') }}</b>
+      <img src="/images/icon-discord.png" alt="discord logo icon" />&nbsp;<b class="text--discord">
+        {{ $t('footer.discord') }}
+      </b>
     </a>
 
     <div style="display: none">&int; ukryta taktyczna całka do programowania w HTMLu</div>
@@ -36,4 +38,4 @@ export default defineComponent({
     }
   }
 });
-</script>
+</script>