feat: add default 504 page, fix few translations

blockpage/502.html

@@ -23,7 +23,8 @@
           <td>
             <div id="title" style="font-size: 48px">502 Bad Gateway</div>
             <div id="desc" style="font-size: 20px; color: rgba(0, 0, 0, 0.7)">
-              Server can not be reached, please try again later
+              The server encountered a temporary error and could not complete
+              your request. Please try again later.
             </div>
             <div
               style="
@@ -48,7 +49,7 @@
                   top: 137px;
                 "
               >
-                Safeline WAF
+                Safeline
               </div>
               <div
                 id="upstream"
@@ -60,7 +61,7 @@
                   color: white;
                 "
               >
-                Upstream
+                Origin Server
               </div>
               <img
                 style="width: 100%; height: 100%; display: block"
@@ -91,12 +92,12 @@
             background-color: rgba(0, 0, 0, 0.3);
           "
         ></span>
-        <span id="powered-by">Powered by</span>
+        <span id="powered-by">security by</span>
         <a
           href="https://waf-ce.chaitin.cn"
           style="color: #27b876; text-decoration: none"
           id="safeline-waf"
-          >Safeline WAF</a
+          >SafeLine</a
         >
         <span id="powered-by-tail"></span>
       </div>