Update deeplXUrl placeholder and default value

src/lib/Setting/Pages/LanguageSettings.svelte

@@ -74,7 +74,7 @@
     {/if}
 
     {#if $DataBase.translatorType === 'deeplX'}
-        <span class="text-textcolor mt-4">{language.deeplXUrl}</span>
+        <span class="text-textcolor mt-4" placeholder="http://localhost:1188">{language.deeplXUrl}</span>
         <TextInput bind:value={$DataBase.deeplXOptions.url} />
         
         <span class="text-textcolor mt-4">{language.deeplXToken}</span>

src/ts/translator/translator.ts

@@ -137,7 +137,7 @@ async function translateMain(text:string, arg:{from:string, to:string, host:stri
             }
         }
 
-        let url = db.deeplXOptions.url;
+        let url = db.deeplXOptions.url ?? 'http://localhost:1188'
 
         if(url.endsWith('/')){
             url = url.slice(0, -1)