• Progress bar / slider can stay blue in Sepia

@JMinor @cmadeo maybe "Dim images" instead of "Image dimming"?

@NHarateh_WMF If not we probably want the "D" in dimming to be lower case - looks like it's upper case presently.

@Mhurd we can definitely do 'Dim images,' would it be possible to run a quick review of the string in a couple of longer languages?

Also prefer "Dim images", we generally use the Verb-Object pattern in settings ("Send reports", "Clear cached data", "Support Wikipedia", etc)

Testing criteria:

1. Open any article in the app
2. Tap on the "tT" icon
3. Slide the brightness slider and ensure that the screen brightness is being adjusted
4. Swipe up to reveal the phone's Control Center
5. Slide the brightness slider in the Control Center and ensure that the brightness slider in the article controls matches the system slider
6. Slide the font size slider and ensure that the font size in the article is being adjusted
7. Tap on theme buttons and ensure that respective themes are being applied to the app
8. Ensure that the bordered theme button corresponds to the current theme of the app
9. Ensure that the "Dim images" switch is enabled only for the dark theme

@NHarateh_WMF

Yay! This is looking really good!

I just have a few small design updates that came up from playing around with the feature more:

• Would it be possible to dismiss the popover when the user clicks on a different item in the toolbar? Eg. I've finished selecting a Reading Theme and would like to open the table of contents
• Currently the disabled state for 'Dim images' looks clear on Sepia and Default when the user has the toggle set to on, but it's not clear that it's disabled when it's set to off. Could we make the disabled state a bit more prominent?

Zeplin: https://zpl.io/ADWNl	Zeplin: https://zpl.io/Z1J0VtV

@cmadeo -

• Dismissing the popover
• More prominent switch for disabled state

@NHarateh_WMF awesome! Thank you!

Testing on iPhone 6s (iOS 10.3.3) and Wikipedia app 5.6.0 (1185). This is mostly working as expected as shown in a few sample images I'm providing (mostly default theme, but can test in sepia and dark too)

Now, while the dim images button can only *be enabled* in the dark theme, if it is already enabled there then it will continue to be turned on when switched to sepia and default themes, this is the one area for the staff to decide if it is ok or not

Tested on iPhone 7+ with iOS 10.3, iPhone 4 with iOS 9.3, and iPad Pro with iOS 10.3 on Beta App version 5.6.0 (1185)

Looks good.