build(rm): add fluent dependency for internationalization

Add the fluent crate to enable localized messages in the rm utility, improving user experience across different locales.

Author: mattsu2020

src/uu/rm/Cargo.toml

@@ -22,6 +22,7 @@ thiserror = { workspace = true }
 clap = { workspace = true }
 uucore = { workspace = true, features = ["fs", "parser", "safe-traversal"] }
 indicatif = { workspace = true }
+fluent = { workspace = true }
 
 [target.'cfg(unix)'.dependencies]
 libc = { workspace = true }