fixed a message key

Signed-off-by: Gerald <[email protected]>

_locales/cs/messages.json

@@ -327,7 +327,7 @@
 		"description": "Hint for vacuuming data.",
 		"message": "Zbavit se nadbytečného a zkusit znovu načíst chybějící zdroje v cache."
 	},
-	"Use @downloadURL": {
+	"hintUseDownloadURL": {
 		"description": "Shown as a place holder for @updateURL when it is not assigned",
 		"message": "Use @downloadURL"
 	},

_locales/en/messages.json

@@ -327,7 +327,7 @@
 		"description": "Hint for vacuuming data.",
 		"message": "Discard the redundancy and try to reload the missing resources in cache."
 	},
-	"Use @downloadURL": {
+	"hintUseDownloadURL": {
 		"description": "Shown as a place holder for @updateURL when it is not assigned",
 		"message": "Use @downloadURL"
 	},

_locales/pl/messages.json

@@ -327,7 +327,7 @@
 		"description": "Hint for vacuuming data.",
 		"message": "Usuń nadmiarowość i spróbuj przeładować brakujące dane w pamięci podręcznej."
 	},
-	"Use @downloadURL": {
+	"hintUseDownloadURL": {
 		"description": "Shown as a place holder for @updateURL when it is not assigned",
 		"message": "Use @downloadURL"
 	},

_locales/ru/messages.json

@@ -327,7 +327,7 @@
 		"description": "Hint for vacuuming data.",
 		"message": "Сбросить избыточность кэша и попробовать подгрузить недостающие ресурсы"
 	},
-	"Use @downloadURL": {
+	"hintUseDownloadURL": {
 		"description": "Shown as a place holder for @updateURL when it is not assigned",
 		"message": "Use @downloadURL"
 	},

_locales/zh/messages.json

@@ -327,7 +327,7 @@
 		"description": "Hint for vacuuming data.",
 		"message": "丢弃多余的数据，并尝试重新获取缺失的资源。"
 	},
-	"Use @downloadURL": {
+	"hintUseDownloadURL": {
 		"description": "Shown as a place holder for @updateURL when it is not assigned",
 		"message": "使用@downloadURL"
 	},

options.js

@@ -313,7 +313,7 @@ function mReset(){
 	mH.value=c.homepageURL||'';
 	mH.placeholder=m.homepageURL||'';
 	mU.value=c.updateURL||'';
-	mU.placeholder=m.updateURL||_('Use @downloadURL');
+	mU.placeholder=m.updateURL||_('hintUseDownloadURL');
 	mD.value=c.downloadURL||'';
 	mD.placeholder=m.downloadURL||c.lastInstallURL||'';
 	switch(c['run-at']){