New notebookbar string in sc/messages.po, sd/messages.po and sw/messages.po (as of May 15 2018) has a tilde accelerator instead of the underscore (needed for glade strings):
~Check for Updates... (appears several times, like 10x)
Steps to Reproduce:
1. See the code (or master build - the notebookbar).
Accelerator not properly defined.
Should be an underscore.
User Profile Reset: No
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:60.0) Gecko/20100101 Firefox/60.0
andreas kainz committed a patch related to this issue.
It has been pushed to "master":
tdf#117630 wrong accelerator character for update command
It will be available in 6.1.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.