These are automatically populated texts, for example a document description in a foreign language when making a payment — "Settlement of document".
The solution is to set the Czech locale on the server, locally in the file /Applications/FlexiBee.app/Contents/Info.plist in the section (near the bottom of the file):
<key>JVMOptions</key>
<array>
<string>-Xmx1g</string>
....
</array>
add the following parameters:
<string>-Duser.country=CZ</string>
<string>-Duser.language=cs</string>

