Add i18n by using rust i18n (#807)

* feat: initial i18n setup

* style: fmt

* feat: i18n support for new steps

* fix: build on Linux

* fix: build on Linux

* refactor: rm unused translation keys

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Co-authored-by: Steve Lau <stevelauc@outlook.com>

Cargo.toml

@@ -52,6 +52,8 @@ merge = "~0.1"
 regex-split = "~0.1"
 notify-rust = "~4.11"
 wildmatch = "2.3.0"
+rust-i18n = "3.0.1"
+sys-locale = "0.3.1"
 
 [package.metadata.generate-rpm]
 assets = [{ source = "target/release/topgrade", dest = "/usr/bin/topgrade" }]