luci-proto-wireguard: use "Optional" instead of "Optional." as translation
authorJo-Philipp Wich <jo@mein.io>
Tue, 30 May 2017 19:45:54 +0000 (21:45 +0200)
committerJo-Philipp Wich <jo@mein.io>
Tue, 30 May 2017 19:45:54 +0000 (21:45 +0200)
This allows sharing the translation string with other components.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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