en-GB files are errors after upgrade to Joomla 5.1.2

I got the following errors and contacted Joomla and they wrote the following:

"here are lots of language files missing, most of them belong to extensions. This is not a Joomla core issue. You did not write from where you updated."

They all cannot be missing at the same time including the Joomla core en-GB. It does not make sense.

errors:
Extension    File
joomla    
+ /language/en-GB/joomla.ini
lib_joomla    
+ /language/en-GB/lib_joomla.ini
plg_system_djjquerymonster    
- /administrator/language/en-GB/plg_system_djjquerymonster.ini
- /administrator/language/en-GB/en-GB.plg_system_djjquerymonster.ini
- /plugins/system/djjquerymonster/language/en-GB/plg_system_djjquerymonster.ini
+ /plugins/system/djjquerymonster/language/en-GB/en-GB.plg_system_djjquerymonster.ini
plg_system_kunena.sys    
- /administrator/language/en-GB/plg_system_kunena.sys.ini
- /administrator/language/en-GB/en-GB.plg_system_kunena.sys.ini
- /plugins/system/kunena/language/en-GB/plg_system_kunena.sys.ini
+ /plugins/system/kunena/language/en-GB/en-GB.plg_system_kunena.sys.ini
plg_system_regularlabs    
- /libraries/regularlabs/language/en-GB/plg_system_regularlabs.ini
- /libraries/regularlabs/language/en-GB/en-GB.plg_system_regularlabs.ini
- /plugins/system/modals/language/en-GB/plg_system_regularlabs.ini
- /plugins/system/modals/language/en-GB/en-GB.plg_system_regularlabs.ini
- /plugins/system/regularlabs/language/en-GB/plg_system_regularlabs.ini
+ /plugins/system/regularlabs/language/en-GB/en-GB.plg_system_regularlabs.ini
plg_system_modals    
- /administrator/language/en-GB/plg_system_modals.ini
- /administrator/language/en-GB/en-GB.plg_system_modals.ini
- /plugins/system/modals/language/en-GB/plg_system_modals.ini
+ /plugins/system/modals/language/en-GB/en-GB.plg_system_modals.ini
plg_system_modulesanywhere    
- /administrator/language/en-GB/plg_system_modulesanywhere.ini
- /administrator/language/en-GB/en-GB.plg_system_modulesanywhere.ini
- /plugins/system/modulesanywhere/language/en-GB/plg_system_modulesanywhere.ini
+ /plugins/system/modulesanywhere/language/en-GB/en-GB.plg_system_modulesanywhere.ini
plg_system_sourcerer    
- /administrator/language/en-GB/plg_system_sourcerer.ini
- /administrator/language/en-GB/en-GB.plg_system_sourcerer.ini
- /plugins/system/sourcerer/language/en-GB/plg_system_sourcerer.ini
+ /plugins/system/sourcerer/language/en-GB/en-GB.plg_system_sourcerer.ini
plg_system_weblinks    
- /administrator/language/en-GB/plg_system_weblinks.ini
+ /administrator/language/en-GB/en-GB.plg_system_weblinks.ini
plg_system_gantry5.sys    
- /administrator/language/en-GB/plg_system_gantry5.sys.ini
- /administrator/language/en-GB/en-GB.plg_system_gantry5.sys.ini
- /plugins/system/gantry5/language/en-GB/plg_system_gantry5.sys.ini
+ /plugins/system/gantry5/language/en-GB/en-GB.plg_system_gantry5.sys.ini
plg_system_gantry5    
- /administrator/language/en-GB/plg_system_gantry5.ini
- /administrator/language/en-GB/en-GB.plg_system_gantry5.ini
- /plugins/system/gantry5/language/en-GB/plg_system_gantry5.ini
- /plugins/system/gantry5/language/en-GB/en-GB.plg_system_gantry5.ini
files_gantry5_nucleus    
- /language/en-GB/files_gantry5_nucleus.ini
+ /language/en-GB/en-GB.files_gantry5_nucleus.ini
tpl_g5_hydrogen_positions    
- /templates/g5_hydrogen/custom/language/en-GB/tpl_g5_hydrogen_positions.ini
+ /templates/g5_hydrogen/custom/language/en-GB/en-GB.tpl_g5_hydrogen_positions.ini
tpl_g5_hydrogen    
- /templates/g5_hydrogen/language/en-GB/tpl_g5_hydrogen.ini
+ /templates/g5_hydrogen/language/en-GB/en-GB.tpl_g5_hydrogen.ini
- /templates/g5_hydrogen/custom/language/en-GB/tpl_g5_hydrogen.ini
- /templates/g5_hydrogen/custom/language/en-GB/en-GB.tpl_g5_hydrogen.ini
- /language/en-GB/tpl_g5_hydrogen.ini
- /language/en-GB/en-GB.tpl_g5_hydrogen.ini
com_content    
+ /language/en-GB/com_content.ini
com_djmediatools    
- /language/en-GB/com_djmediatools.ini
- /language/en-GB/en-GB.com_djmediatools.ini
- /components/com_djmediatools/language/en-GB/com_djmediatools.ini
+ /components/com_djmediatools/language/en-GB/en-GB.com_djmediatools.ini
mod_djclassifieds_menu    
- /language/en-GB/mod_djclassifieds_menu.ini
- /language/en-GB/en-GB.mod_djclassifieds_menu.ini
- /modules/mod_djclassifieds_menu/language/en-GB/mod_djclassifieds_menu.ini
+ /modules/mod_djclassifieds_menu/language/en-GB/en-GB.mod_djclassifieds_menu.ini
plg_fields_calendar    
+ /administrator/language/en-GB/plg_fields_calendar.ini
plg_fields_checkboxes    
+ /administrator/language/en-GB/plg_fields_checkboxes.ini
plg_fields_color    
+ /administrator/language/en-GB/plg_fields_color.ini
plg_fields_editor    
+ /administrator/language/en-GB/plg_fields_editor.ini
plg_fields_imagelist    
+ /administrator/language/en-GB/plg_fields_imagelist.ini
plg_fields_integer    
+ /administrator/language/en-GB/plg_fields_integer.ini
plg_fields_list    
+ /administrator/language/en-GB/plg_fields_list.ini
plg_fields_media    
+ /administrator/language/en-GB/plg_fields_media.ini
plg_fields_radio    
+ /administrator/language/en-GB/plg_fields_radio.ini
plg_fields_sql    
+ /administrator/language/en-GB/plg_fields_sql.ini
plg_fields_subform    
+ /administrator/language/en-GB/plg_fields_subform.ini
plg_fields_text    
+ /administrator/language/en-GB/plg_fields_text.ini
plg_fields_textarea    
+ /administrator/language/en-GB/plg_fields_textarea.ini
plg_fields_url    
+ /administrator/language/en-GB/plg_fields_url.ini
plg_fields_user    
+ /administrator/language/en-GB/plg_fields_user.ini
plg_fields_usergrouplist    
+ /administrator/language/en-GB/plg_fields_usergrouplist.ini
plg_content_jw_allvideos    
- /administrator/language/en-GB/plg_content_jw_allvideos.ini
+ /administrator/language/en-GB/en-GB.plg_content_jw_allvideos.ini
plg_content_plgzhosmmap    
- /administrator/language/en-GB/plg_content_plgzhosmmap.ini
+ /administrator/language/en-GB/en-GB.plg_content_plgzhosmmap.ini
plg_content_plgzhosmmap_article_overview    
- /administrator/language/en-GB/plg_content_plgzhosmmap_article_overview.ini
+ /administrator/language/en-GB/en-GB.plg_content_plgzhosmmap_article_overview.ini
tpl_    
- /templates//language/en-GB/tpl_.ini
- /templates//language/en-GB/en-GB.tpl_.ini
plg_system_cookiesck    
- /administrator/language/en-GB/plg_system_cookiesck.ini
+ /administrator/language/en-GB/en-GB.plg_system_cookiesck.ini
plg_schemaorg_article    
+ /administrator/language/en-GB/plg_schemaorg_article.ini
plg_schemaorg_custom    
+ /administrator/language/en-GB/plg_schemaorg_custom.ini
plg_schemaorg_blogposting    
+ /administrator/language/en-GB/plg_schemaorg_blogposting.ini
plg_schemaorg_book    
+ /administrator/language/en-GB/plg_schemaorg_book.ini
plg_schemaorg_event    
+ /administrator/language/en-GB/plg_schemaorg_event.ini
plg_schemaorg_organization    
+ /administrator/language/en-GB/plg_schemaorg_organization.ini
plg_schemaorg_person    
+ /administrator/language/en-GB/plg_schemaorg_person.ini
plg_schemaorg_recipe    
+ /administrator/language/en-GB/plg_schemaorg_recipe.ini
plg_schemaorg_jobposting    
+ /administrator/language/en-GB/plg_schemaorg_jobposting.ini
plg_system_debug    
+ /administrator/language/en-GB/plg_system_debug.ini
 

I'm not sure what this has to do with CB. We don't have any control over your plugins missing language files. CB is not listed there as its component name is com_comprofiler. CB also doesn't use Joomla language files (it will in CB 3.x) as we've our own language plugin structure.

Thank you Krileon.
I was looking to know if your team has seen anything like it, not necessarily that it had to do something CB.

Did you check the folders that it's saying has missing language files? Are you having issues with strings not displaying properly? Within System > Install > Discover try doing discovery to see if anything failed to fully install (we had this problem when we went from J3 > J4 > J5). For third party extensions though you could re-install them and that should fix their missing language files. Aside from that I'm not sure what to suggest.

Thank you Krileon. I will try the discovery. My hunch is that is related of what you wrote "We had this problem when we went from J3 > J4 > J5" since I went the same route during the last several months and I just discovering it now. I will go one step of the time.

The only fix we could find for missing files was to re-install those extensions. As for Joomla missing files we were missing the Schema plugins, which was fixed by discovery. I don't think we were missing anything else though.