I was making a custom language and I found that the Multiplayer name doesn't show as "Online Mode" (What I wanted it to show up as with the lang) and even the text in "Customize" for Superflat don't work.
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Then you're doing it wrong. See screenshots.
No, I made a language file in the languages file and modified the text. I copied the language from the US English one

You're still doing it wrong.
Then how is it done correctly?

Copy en_US.lang
to ab_CD.lang
Replace there
menu.multiplayer=Multiplayer
with
menu.multiplayer=MC-18414
That's what I did...
I searched ab_CD and couldn't find it, can I do it with any file?
How are you changing it? with a resource pack or in the .minecraft folder?
I'm changing it in the .minecraft folder. I know that languages in Resource packs don't work, so I'm doing it by modifying the lang folder by creating a new language and copying the language in English and pasting it in mine. Is the reason it wont work because the lines are to long?