Clean up lock screen

Signal/translations/en.lproj/Localizable.strings

@@ -2599,3 +2599,4 @@
 "Please check the public key you entered and try again." = "Please check the public key you entered and try again.";
 "Looks like you don't have any conversations yet. Get started by messaging a friend." = "Looks like you don't have any conversations yet. Get started by messaging a friend.";
 "Enter the public key of the person you'd like to securely message. They can share their public key with you by going into Loki Messenger's in-app settings and clicking \"Share Public Key\"." = "Enter the public key of the person you'd like to securely message. They can share their public key with you by going into Loki Messenger's in-app settings and clicking \"Share Public Key\".";
+"Unlock Loki Messenger" = "Unlock Loki Messenger";

SignalMessaging/ViewControllers/ScreenLockViewController.m

@@ -57,11 +57,10 @@ NSString *NSStringForScreenLockUIState(ScreenLockUIState value)
 
     const CGFloat kButtonHeight = 40.f;
     OWSFlatButton *button =
-        [OWSFlatButton buttonWithTitle:NSLocalizedString(@"SCREEN_LOCK_UNLOCK_SIGNAL",
-                                           @"Label for button on lock screen that lets users unlock Signal.")
+        [OWSFlatButton buttonWithTitle:NSLocalizedString(@"Unlock Loki Messenger", @"")
                                   font:[OWSFlatButton fontForHeight:kButtonHeight]
-                            titleColor:[UIColor ows_materialBlueColor]
-                       backgroundColor:[UIColor whiteColor]
+                            titleColor:UIColor.whiteColor
+                       backgroundColor:UIColor.clearColor
                                 target:self
                               selector:@selector(showUnlockUI)];
     [edgesView addSubview:button];