Lokalize: Refresh top-level menu availability on Welcome screen

Tanish Kumarrequested to merge
tanishfr/lokalize:work/menu-greyout-welcome into master

Menu state could stay stale when Welcome is shown (after closing the last tab or at startup).

This patch refreshes menu availability in showWelcome() and initializes startup through showWelcome() so the same refresh path always runs.

Edited by Finley Watson

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