Fix inability to use local LibreTranslate without setting ALLOWED_PRIVATE_ADDRESSES (#21926)

Fixes #20029

app/lib/request.rb

@@ -30,7 +30,8 @@ class Request
     @verb        = verb
     @url         = Addressable::URI.parse(url).normalize
     @http_client = options.delete(:http_client)
-    @options     = options.merge(socket_class: use_proxy? ? ProxySocket : Socket)
+    @allow_local = options.delete(:allow_local)
+    @options     = options.merge(socket_class: use_proxy? || @allow_local ? ProxySocket : Socket)
     @options     = @options.merge(proxy_url) if use_proxy?
     @headers     = {}
 

app/lib/translation_service/libre_translate.rb

@@ -27,7 +27,7 @@ class TranslationService::LibreTranslate < TranslationService
 
   def request(text, source_language, target_language)
     body = Oj.dump(q: text, source: source_language.presence || 'auto', target: target_language, format: 'html', api_key: @api_key)
-    req = Request.new(:post, "#{@base_url}/translate", body: body)
+    req = Request.new(:post, "#{@base_url}/translate", body: body, allow_local: true)
     req.add_headers('Content-Type': 'application/json')
     req
   end