review(#1657): Lao is selectable and renders on the web

- Language gains lo-LA, labelled ລາວ in every catalog, so the new
  translation can be chosen.
- Two Lao keys under stale names now use the catalog's names, and the
  touchpad option added since gets its Lao label.
- The web build gets a Lao font (Noto Sans Lao, generated like Thai) and
  routes Lao and Thai drawing text to their fonts; Thai had a font but
  was never routed to it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/i18n.rs

@@ -53,6 +53,8 @@ pub enum Language {
     JaJp,
     #[serde(rename = "ko-KR")]
     KoKr,
+    #[serde(rename = "lo-LA")]
+    LoLa,
     #[serde(rename = "cs-CZ")]
     CsCz,
     #[serde(rename = "it-IT")]
@@ -70,7 +72,7 @@ pub enum Language {
 }
 
 impl Language {
-    pub const ALL: [Language; 22] = [
+    pub const ALL: [Language; 23] = [
         Language::System,
         Language::EnUs,
         Language::BgBg,
@@ -85,6 +87,7 @@ impl Language {
         Language::ItIt,
         Language::JaJp,
         Language::KoKr,
+        Language::LoLa,
         Language::PlPl,
         Language::RuRu,
         Language::ZhCn,
@@ -112,6 +115,7 @@ impl Language {
             Language::ArSa => vec!["ar-SA".parse().expect("valid locale")],
             Language::JaJp => vec!["ja-JP".parse().expect("valid locale")],
             Language::KoKr => vec!["ko-KR".parse().expect("valid locale")],
+            Language::LoLa => vec!["lo-LA".parse().expect("valid locale")],
             Language::CsCz => vec!["cs-CZ".parse().expect("valid locale")],
             Language::ItIt => vec!["it-IT".parse().expect("valid locale")],
             Language::FiFi => vec!["fi-FI".parse().expect("valid locale")],
@@ -139,6 +143,7 @@ impl Language {
             Language::ArSa => crate::tr!("language", "arabic"),
             Language::JaJp => crate::tr!("language", "japanese"),
             Language::KoKr => crate::tr!("language", "korean"),
+            Language::LoLa => crate::tr!("language", "lao"),
             Language::CsCz => crate::tr!("language", "czech"),
             Language::ItIt => crate::tr!("language", "italian"),
             Language::FiFi => crate::tr!("language", "finnish"),

src/scene/text/web_font.rs

@@ -31,6 +31,7 @@ pub enum Script {
     Arabic,
     Hebrew,
     Thai,
+    Lao,
     Devanagari,
     Chinese,
     TraditionalChinese,
@@ -49,6 +50,7 @@ impl Script {
             Script::Arabic => "fonts/arabic.ttf",
             Script::Hebrew => "fonts/hebrew.ttf",
             Script::Thai => "fonts/thai.ttf",
+            Script::Lao => "fonts/lao.ttf",
             Script::Devanagari => "fonts/devanagari.ttf",
             Script::Chinese => "fonts/chinese.ttf",
             Script::TraditionalChinese => "fonts/traditional_chinese.ttf",
@@ -69,6 +71,7 @@ impl Script {
             | Script::Arabic
             | Script::Hebrew
             | Script::Thai
+            | Script::Lao
             | Script::Devanagari => "Noto Sans",
         }
     }
@@ -85,6 +88,7 @@ impl Script {
             8 => Script::Japanese,
             9 => Script::Korean,
             10 => Script::TraditionalChinese,
+            11 => Script::Lao,
             _ => Script::Latin,
         }
     }
@@ -103,6 +107,7 @@ impl Script {
             Script::Japanese => 8,
             Script::Korean => 9,
             Script::TraditionalChinese => 10,
+            Script::Lao => 11,
         }
     }
 }
@@ -143,6 +148,7 @@ pub fn scripts_for_language_tag(language: &str) -> Vec<Script> {
             "ko" => Some(Script::Korean),
             "ru" | "uk" | "bg" | "sr" => Some(Script::Cyrillic),
             "th" => Some(Script::Thai),
+            "lo" => Some(Script::Lao),
             "zh" => Some(Script::Chinese),
             _ => None,
         }
@@ -176,6 +182,7 @@ pub fn requires_shaping(text: &str) -> bool {
                 | 0x08A0..=0x08FF
                 | 0x0900..=0x097F
                 | 0x0E00..=0x0E7F
+                | 0x0E80..=0x0EFF
                 | 0xA8E0..=0xA8FF
                 | 0xFB1D..=0xFB4F
                 | 0xFB50..=0xFDFF
@@ -224,6 +231,8 @@ pub fn script_of(ch: char) -> Option<Script> {
             Script::Arabic
         }
         0x0900..=0x097F | 0xA8E0..=0xA8FF => Script::Devanagari,
+        0x0E00..=0x0E7F => Script::Thai,
+        0x0E80..=0x0EFF => Script::Lao,
         // Hangul → always Korean; kana → always Japanese.
         0x1100..=0x11FF | 0x3130..=0x318F | 0xAC00..=0xD7A3 => Script::Korean,
         0x3040..=0x30FF | 0x31F0..=0x31FF => Script::Japanese,