fix: Ternary expression workaround for i18n:parse

src/lib/components/playground/ChatCompletion.svelte

@@ -26,13 +26,15 @@
 			</div>
 
 			<div class="flex-1">
+				<!-- $i18n.t('a user') -->
+				<!-- $i18n.t('an assistant') -->
 				<textarea
 					id="{message.role}-{idx}-textarea"
 					bind:this={textAreaElement}
 					class="w-full bg-transparent outline-none rounded-lg p-2 text-sm resize-none overflow-hidden"
-					placeholder={$i18n.t(
-						`Enter ${message.role === 'user' ? 'a user' : 'an assistant'} message here`
-					)}
+					placeholder={$i18n.t(`Enter {{role}} message here`, {
+						role: message.role === 'user' ? $i18n.t('a user') : $i18n.t('an assistant')
+					})}
 					rows="1"
 					on:input={(e) => {
 						textAreaElement.style.height = '';