Added IT language support (#413)

library/src/layout/table.rs

@@ -284,6 +284,7 @@ impl LocalName for TableElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
             Lang::GERMAN => "Tabelle",
+            Lang::ITALIAN => "Tabella",
             Lang::ENGLISH | _ => "Table",
         }
     }

library/src/math/mod.rs

@@ -268,6 +268,7 @@ impl LocalName for EquationElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
             Lang::GERMAN => "Gleichung",
+            Lang::ITALIAN => "Equazione",
             Lang::ENGLISH | _ => "Equation",
         }
     }

library/src/meta/bibliography.rs

@@ -183,6 +183,7 @@ impl LocalName for BibliographyElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
             Lang::GERMAN => "Bibliographie",
+            Lang::ITALIAN => "Bibliografia",
             Lang::ENGLISH | _ => "Bibliography",
         }
     }

library/src/meta/figure.rs

@@ -87,6 +87,7 @@ impl LocalName for FigureElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
             Lang::GERMAN => "Abbildung",
+            Lang::ITALIAN => "Figura",
             Lang::ENGLISH | _ => "Figure",
         }
     }

library/src/meta/heading.rs

@@ -141,6 +141,7 @@ impl LocalName for HeadingElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
             Lang::GERMAN => "Abschnitt",
+            Lang::ITALIAN => "Sezione",
             Lang::ENGLISH | _ => "Section",
         }
     }

library/src/meta/outline.rs

@@ -180,6 +180,7 @@ impl LocalName for OutlineElem {
     fn local_name(&self, lang: Lang) -> &'static str {
         match lang {
             Lang::GERMAN => "Inhaltsverzeichnis",
+            Lang::ITALIAN => "Indice",
             Lang::ENGLISH | _ => "Contents",
         }
     }

src/doc.rs

@@ -517,6 +517,7 @@ pub struct Lang([u8; 3], u8);
 impl Lang {
     pub const ENGLISH: Self = Self(*b"en ", 2);
     pub const GERMAN: Self = Self(*b"de ", 2);
+    pub const ITALIAN: Self = Self(*b"it ", 2);
 
     /// Return the language code as an all lowercase string slice.
     pub fn as_str(&self) -> &str {