The authority edit dropdown reads "Titel bearbeiten", which is copied from biblio and does not really work for authorities. More generic "Datensatz bearbeiten" would be closer to the English "Edit record".
Hi, translations are maintained on translate.koha-community.org and usually not reported as bugs here. I have changed the string for all available versions as suggested. The change will be included in the next scheduled releases. As 19.05 is no longer maintained there won't be an automatic fix for it. The easiest workaround would be a fix in the template in this case. Alternatively the local po files could be fixed and the translation rerun. I don't recomment to download po files from Pootle if you are not on the very latest 19.05. It could result in unwanted changes and "untranslations". Usually it's better if version of Koha and the one the po files were created for match exactly.