Added ZH language support (#481)

library/src/layout/table.rs

@@ -283,6 +283,7 @@ impl<T: Into<Value>> From<Celled<T>> for Value {
 impl LocalName for TableElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
+            Lang::CHINESE => "表",
             Lang::GERMAN => "Tabelle",
             Lang::ITALIAN => "Tabella",
             Lang::RUSSIAN => "Таблица",

library/src/math/mod.rs

@@ -267,6 +267,7 @@ impl Count for EquationElem {
 impl LocalName for EquationElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
+            Lang::CHINESE => "等式",
             Lang::GERMAN => "Gleichung",
             Lang::ITALIAN => "Equazione",
             Lang::RUSSIAN => "Уравнение",

library/src/meta/bibliography.rs

@@ -182,6 +182,7 @@ impl Show for BibliographyElem {
 impl LocalName for BibliographyElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
+            Lang::CHINESE => "参考文献",
             Lang::GERMAN => "Bibliographie",
             Lang::ITALIAN => "Bibliografia",
             Lang::RUSSIAN => "Библиография",

library/src/meta/figure.rs

@@ -86,6 +86,7 @@ impl Count for FigureElem {
 impl LocalName for FigureElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
+            Lang::CHINESE => "图",
             Lang::GERMAN => "Abbildung",
             Lang::ITALIAN => "Figura",
             Lang::RUSSIAN => "Рисунок",

library/src/meta/heading.rs

@@ -140,6 +140,7 @@ cast_from_value! {
 impl LocalName for HeadingElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
+            Lang::CHINESE => "小节",
             Lang::GERMAN => "Abschnitt",
             Lang::ITALIAN => "Sezione",
             Lang::RUSSIAN => "Раздел",

library/src/meta/outline.rs

@@ -179,6 +179,7 @@ impl Show for OutlineElem {
 impl LocalName for OutlineElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
+            Lang::CHINESE => "目录",
             Lang::GERMAN => "Inhaltsverzeichnis",
             Lang::ITALIAN => "Indice",
             Lang::RUSSIAN => "Содержание",

src/doc.rs

@@ -515,6 +515,7 @@ pub struct Glyph {
 pub struct Lang([u8; 3], u8);
 
 impl Lang {
+    pub const CHINESE: Self = Self(*b"zh ", 2);
     pub const ENGLISH: Self = Self(*b"en ", 2);
     pub const GERMAN: Self = Self(*b"de ", 2);
     pub const RUSSIAN: Self = Self(*b"ru ", 2);