Macro t 

macro_rules! t {
    ($mgr:expr, $key:literal) => { ... };
    ($mgr:expr, $ns:literal, $key:literal) => { ... };
    ($mgr:expr, $key:literal, $($arg_k:literal = $arg_v:expr),* $(,)?) => { ... };
}

Convenience: t!(mgr, “panel.inspector”) → translated string