I don't know how to add language strings on my module to be used in a popup message. I'm only able to use language string when I add them on the /lang/en.json
I atthach a file to ilustrate it.
"clicmyphoto": "string in the plugin",
The "clicmyphoto" defined in the lang section is not loaded and I get a [ [ clicmyphoto ] ] if I don't add it on the /lang/en.json core file.