Update custom dns strings

[Rawa]

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This change is 

[linear]

DROID-1346 Update custom DNS warning regarding lan sharing text

[Pururun]

Reviewed 27 of 27 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @Rawa)

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android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/textfield/DnsTextField.kt line 43 at r2 (raw file):

@Composable
private fun ErrorSupportingText(text: String) {

If we make the icon optional we can use this for more dialogs such as create custom list

[Pururun]

Reviewed 5 of 5 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[Pururun]

Reviewed 2 of 2 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved