add message properties

bwreg-webapp/src/main/resources/msg/messages_de.properties

 accept_tou=Ich habe die Nutzungsbedingungen gelesen und bin einverstanden.
+set_ssh_pub_key=SSH Key setzen
 ssh_pub_key_command=SSH Key f\u00FCr benannte Kommandos
 ssh_pub_key_interactiv=SSH Key f\u00FCr eine interaktive Shell
 set_ssh_pub_key_for=SSH Key freischalten\: 

bwreg-webapp/src/main/resources/msg/messages_en.properties

 aa_entities=Attribute authorities
+set_ssh_pub_key=Set SSH Key
 accept_tou=I have read and accepted the terms of use.
 access_check=Check access
 ssh_pub_key_command=SSH Key for named commands