locales: introduce Internationalization / Locales

* using crate locales

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

Cargo.toml

@@ -23,3 +23,6 @@ features = [ "postgres", "sqlite" ]
 
 [dependencies.dotenv]
 version = "0.10.0"
+
+[dependencies.locales]
+version = "0.1.0"

locales/main.json

@@ -0,0 +1,15 @@
+{
+  "err.user.not_found": {
+    "fr": "Utilisateur introuvable: $email, $id",
+    "de": "Anwender nicht gefunden: $email, $id",
+    "en": "User not found: $email, $id"
+  },
+  "main.start": {
+    "de": "Programmlogik starten",
+    "en": "Starting program logic"
+  },
+  "parse.arguments": {
+    "de": "Programmargumente prüfen",
+    "en": "Parsing arguments"
+  }
+}

src/main.rs

@@ -1,12 +1,21 @@
 #[macro_use]
 extern crate clap;
+extern crate locales;
+
 use clap::App;
+use locales::t;
 
 fn main() {
-    println!("Parsing arguments ...");
+    // set locale
+    let lang= "de";
+
     // handle commandline arguments with clap (relative path to cli.yml)
+    let res = t!("parse.arguments", lang);
+    println!("{}", &res);
+
     let yaml = load_yaml!("cli.yml");
     let _matches = App::from_yaml(yaml).get_matches();
 
-    println!("Starting program logic ...");
+    let res = t!("main.start", lang);
+    println!("{}", &res);
 }