Ruby 2.6.1にしても問題ないみたいだからアプリ側のコードも追随するね 
3de63b3c3 (upstream/master) More corrections for the Slovak translation (#9959)
ad8c71c98 Fix link color in high-contrast theme, add underlines (#9949)
1f9519020 Refactor icons in web UI to use Icon component (#9951)
3383ed757 Update the Slovak translation (#9958)
0167659f5 Distinguish error messaging for mystyped URLs and deleted accounts (#9957)
6513f6c95 Replace unlock-alt icon with unlock (#9952)