advotracker_client: adopt usage of crate twine

* i18n crate
* twine::build_translations(): generate the i18n.rs with all
  language translation strings
* twine::build_translations_from_readers(): generates to t!() macro
  readers: the INI files with the translation strings
* twine::t() consumes the strings

crates/advotracker_client/build.rs

@@ -6,8 +6,14 @@
  */
 
 extern crate winres;
+extern crate twine;
+
+use twine::build_translations;
 
 fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+    twine::build_translations(&["./i18n/localization.ini"], "i18n.rs").unwrap();
+
     if cfg!(target_os = "windows") {
 	let mut res = winres::WindowsResource::new();
 	//res.set_icon(".\assets\icons\adovtracker\advotracker.ico")