Provider for Atom linter-spell package to enable LaTeX, TeX and BibTeX spell checking.
Use the Atom package manager and search for "linter-spell-latex", or run
apm install linter-spell-latex from the command line.
The package has support for the following TeX Magic comment
%!TeX spellcheck = en-US,en-DESelect languages
Please note that this package is in an beta state.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.