Fix error when language code is "startrek_it"

Srsly why…

src/components/translation-block.jsx

@@ -114,7 +114,7 @@ function TranslationBlock({
             <span>
               {uiState === 'loading'
                 ? 'Translating…'
-                : sourceLanguage && !detectedLang
+                : sourceLanguage && sourceLangText && !detectedLang
                 ? `Translate from ${sourceLangText}`
                 : `Translate`}
             </span>

src/utils/localeCode2Text.jsx

@@ -1,5 +1,10 @@
 export default function localeCode2Text(code) {
-  return new Intl.DisplayNames(navigator.languages, {
-    type: 'language',
-  }).of(code);
+  try {
+    return new Intl.DisplayNames(navigator.languages, {
+      type: 'language',
+    }).of(code);
+  } catch (e) {
+    console.error(e);
+    return null;
+  }
 }