[QA] sales contact white text on pink background is hard to read

[jnweiger]

Seen with 10.13.1 (and before, not a regression)

• admin general page, enter an expired license key
• the key does not work. OK
• Two notices appear. One, black on yellow at the top of the screen. Well readable, but only temporary. OK
• another one, white on pink, permanently embedded on the web page. this one is hard to read. BAD

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[github-actions[bot]]

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