fix(l10n): Update translations from Transifex

Signed-off-by: Nextcloud bot <[email protected]>

Author: nextcloud-bot

l10n/zh_CN.js

@@ -260,6 +260,7 @@ OC.L10N.register(
     "Yes" : "是",
     "No" : "否",
     "Reset to default" : "重置为默认设置",
+    "Background image" : "背景图片",
     "Learn more" : "了解更多",
     "Invalid URL" : "无效的 URL",
     "Username" : "用户名",

l10n/zh_CN.json

@@ -258,6 +258,7 @@
     "Yes" : "是",
     "No" : "否",
     "Reset to default" : "重置为默认设置",
+    "Background image" : "背景图片",
     "Learn more" : "了解更多",
     "Invalid URL" : "无效的 URL",
     "Username" : "用户名",