登录界面添加登录按钮

parts/language/lang_en.lua

@@ -477,6 +477,7 @@ return{
 			register="Sign up",
 			email="Email address",
 			password="Password",
+			login="Log in",
 		},
 		register={
 			title="Sign up",

parts/language/lang_fr.lua

@@ -474,6 +474,7 @@ return{
 			register="Enregistrement",
 			email="E-mail",
 			password="Mot de passe",
+			login="Connexion",
 		},
 		register={
 			title="Enregistrement",

parts/language/lang_sp.lua

@@ -479,6 +479,7 @@ return{
 			register="Registrarse",
 			email="Correo Elec.",
 			password="Contraseña",
+			login="Entrar",
 		},
 		register={
 			title="Registrarse",

parts/language/lang_symbol.lua

@@ -397,6 +397,7 @@ return{
 			register="Sign up",
 			email="@",
 			password="*",
+			login="Log in",
 		},
 		register={
 			title="Sign up",

parts/language/lang_zh.lua

@@ -500,6 +500,7 @@ return{
 			register="注册",
 			email="邮箱",
 			password="密码",
+			login="登录",
 		},
 		register={
 			title="注册",