Update CTAssetsPicker.strings

Update by user input at transifex.
See https://www.transifex.com/nextcloud/nextcloud/translate/#de_DE/ios-assetspicker/110532133?issue=yes for details.

iOSClient/Supporting Files/en.lproj/CTAssetsPicker.strings

@@ -22,7 +22,7 @@
 
 /* Messages if privacy is not granted */
 "This app does not have access to your photos or videos." = "This app does not have access to your photos or videos.";
-"You can enable access in Privacy Settings." = "You can enable access in Privacy Settings.";
+"You can enable access in Privacy Settings." = "You can grant access in Privacy Settings.";
 
 /* Messages if no assets */
 "No Photos or Videos" = "No Photos or Videos";
@@ -46,4 +46,4 @@
 
 /* Error message of playing stream video */
 "Cannot Play Stream Video" = "Cannot Play Stream Video";
-"OK" = "OK";
+"OK" = "OK";