Added a warning message in admin update while downgrade from 6 to 5

[cfmitrah]

https://luceeserver.atlassian.net/browse/LDEV-3482

[zspitzer]

Can you change

Please be aware when you update to Lucee 5, you will loose all configuration changes made since updating to Lucee 6.

to

Lucee 6 uses a different configuration storage mechanism (.json) than Lucee 5 (.xml). If you downgrade to Lucee 5.x, any configuration changes you have made in Lucee 6 will not be available. Lucee will revert back to the configuration before you upgraded to Lucee 6.

• this needs to be localizable (so move to language files)

[cfmitrah]

@zspitzer I moved the text to the language file

[michaeloffner]

code has changed a lot since this PR was made, so it no longer applies. Sorry for that @cfmitrah