feat(i18n): expand language coverage

Complete missing keys in the existing translations and add selectable Spanish, Brazilian Portuguese, Arabic, and Japanese resources.\n\nThe large compatibility catalogs for the new locales remain in progress.

src/i18n.rs

@@ -41,10 +41,18 @@ pub enum Language {
     RuRu,
     #[serde(rename = "zh-CN")]
     ZhCn,
+    #[serde(rename = "es-ES")]
+    EsEs,
+    #[serde(rename = "pt-BR")]
+    PtBr,
+    #[serde(rename = "ar-SA")]
+    ArSa,
+    #[serde(rename = "ja-JP")]
+    JaJp,
 }
 
 impl Language {
-    pub const ALL: [Language; 9] = [
+    pub const ALL: [Language; 13] = [
         Language::System,
         Language::EnUs,
         Language::TrTr,
@@ -54,6 +62,10 @@ impl Language {
         Language::HiIn,
         Language::RuRu,
         Language::ZhCn,
+        Language::EsEs,
+        Language::PtBr,
+        Language::ArSa,
+        Language::JaJp,
     ];
 
     fn requested(self) -> Vec<i18n_embed::unic_langid::LanguageIdentifier> {
@@ -67,6 +79,10 @@ impl Language {
             Language::HiIn => vec!["hi-IN".parse().expect("valid locale")],
             Language::RuRu => vec!["ru-RU".parse().expect("valid locale")],
             Language::ZhCn => vec!["zh-CN".parse().expect("valid locale")],
+            Language::EsEs => vec!["es-ES".parse().expect("valid locale")],
+            Language::PtBr => vec!["pt-BR".parse().expect("valid locale")],
+            Language::ArSa => vec!["ar-SA".parse().expect("valid locale")],
+            Language::JaJp => vec!["ja-JP".parse().expect("valid locale")],
         }
     }
 
@@ -81,6 +97,10 @@ impl Language {
             Language::HiIn => crate::tr!("language-hindi"),
             Language::RuRu => crate::tr!("language-russian"),
             Language::ZhCn => crate::tr!("language-chinese-simplified"),
+            Language::EsEs => crate::tr!("language-spanish"),
+            Language::PtBr => crate::tr!("language-portuguese"),
+            Language::ArSa => crate::tr!("language-arabic"),
+            Language::JaJp => crate::tr!("language-japanese"),
         }
     }
 }
@@ -131,6 +151,12 @@ fn load_language(
             .and_then(|document| document.document_element())
         {
             let _ = root.set_attribute("lang", &language.to_string());
+            let direction = if language.to_string().starts_with("ar") {
+                "rtl"
+            } else {
+                "ltr"
+            };
+            let _ = root.set_attribute("dir", direction);
         }
     }
     Ok(())