GUI splash screen: change hyphen to em-dash and backup to back up
GUI splash screen: change hyphen to em-dash and backup to back up

The em-dash should be used to connect the two parts of this sentence, rather than a hyphen. In addition, backup is a noun, and should be replaced with the verb.

Although these changes may seem trivial, this greeting is present at every start-up, and plays an important role in the wallet appearing professional.
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