Not a big deal, but as Google phases out Google+, visible references to it should be removed, especially from non-configurable features such as the "Tell a Friend" block for events.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information
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"Tell a Friend" uses SocialNetworks.tpl which has the reference to g:plusone. I haven't figured out how to change it in the repository for future use, I might just not have the access due to just starting to look at things here. I changed it for one of my clients manually.
I merged the PR above - not sure if there are more places. It looks like ideally we would also remove or disable the option value (although what if sites already have data for it?)
Just noting it's still in sql/civicrm_generated.mysql for when you install sample data. It's still showing as an option on dmaster.demo for example. Run regen.sh?