ddns: remove ipv6 nameservers, support custom nameservers (#439)

resource/l10n/en-US.toml

@@ -747,3 +747,6 @@ other = "Expired"
 
 [Days]
 other = "d"
+
+[CustomNameservers]
+other = "Custom Public DNS Nameservers for DDNS (separate with comma)"

resource/l10n/es-ES.toml

@@ -747,3 +747,6 @@ other = "Expired"
 
 [Days]
 other = "d"
+
+[CustomNameservers]
+other = "Servidores DNS públicos personalizados para DDNS (separar con coma)"

resource/l10n/zh-CN.toml

@@ -747,3 +747,6 @@ other = "已到期"
 
 [Days]
 other = "天"
+
+[CustomNameservers]
+other = "自定义DDNS使用的公共DNS服务器（逗号分隔）"

resource/l10n/zh-TW.toml

@@ -747,3 +747,6 @@ other = "已到期"
 
 [Days]
 other = "天"
+
+[CustomNameservers]
+other = "自訂DDNS使用的公共DNS伺服器（逗號分隔）"

resource/template/dashboard-default/setting.html

@@ -53,6 +53,10 @@
                 <label>{{tr "PanelServerDomainAndIP"}}</label>
                 <input type="text" name="GRPCHost" placeholder="" value="{{.Conf.GRPCHost}}">
             </div>
+            <div class="field">
+                <label>{{tr "CustomNameservers"}}</label>
+                <input type="text" name="CustomNameservers" placeholder="" value="{{.Conf.DNSServers}}">
+            </div>
             <div class="field">
                 <label>{{tr "IPChangeAlert"}}</label>
             </div>