Multi-language Documents in LaTeX

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

% Load languages (last one is default)
\usepackage[spanish, french, english]{babel}

\begin{document}

% English (default)
\section{Introduction}
This document demonstrates multi-language support.

% Switch to French
\selectlanguage{french}
\section{Introduction}
Ce document démontre le support multilingue.

% Switch to Spanish  
\selectlanguage{spanish}
\section{Introducción}
Este documento demuestra el soporte multilingüe.

% Back to English
\selectlanguage{english}

% Inline language switching
This is English text with some \foreignlanguage{french}{mots français} 
and \foreignlanguage{spanish}{palabras españolas}.

\end{document}

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[french, spanish, english]{babel}

\begin{document}

% Date formatting
\selectlanguage{english}
Today's date: \today

\selectlanguage{french}
Date d'aujourd'hui: \today

\selectlanguage{spanish}
Fecha de hoy: \today

% Hyphenation patterns
\selectlanguage{english}
\hyphenation{hy-phen-a-tion ex-am-ple}
This is a hyphenation example with very long words.

% Language-specific typography
\selectlanguage{french}
\frenchspacing % French spacing rules
Voici un exemple : avec les espaces françaises !

% Quotes
\selectlanguage{english}
English ``quotes'' are different from \selectlanguage{french}\og guillemets français\fg{} 
and \selectlanguage{spanish}<<comillas españolas>>.

% Language attributes
\selectlanguage{english}
\languageattribute{english}{american} % American English
Color, organize, analyze.

\languageattribute{english}{british} % British English  
Colour, organise, analyse.

\end{document}

\documentclass{article}
\usepackage{polyglossia}

% Set main language
\setdefaultlanguage{english}

% Set other languages
\setotherlanguages{french, spanish, arabic, chinese}

% Font configuration
\usepackage{fontspec}
\setmainfont{Linux Libertine O}
\setsansfont{Linux Biolinum O}
\setmonofont{Inconsolata}

% Language-specific fonts
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2]{Amiri}
\newfontfamily\chinesefont[Scale=0.9]{Noto Sans CJK SC}

\begin{document}

\section{Multilingual with Polyglossia}

This is English text.

\begin{french}
Ceci est un texte français avec les bonnes règles typographiques.
\end{french}

\begin{spanish}  
Este es un texto español con la tipografía correcta.
\end{spanish}

\begin{arabic}
هذا نص عربي مع الاتجاه الصحيح من اليمين إلى اليسار.
\end{arabic}

\begin{chinese}
这是中文文本，使用正确的字体。
\end{chinese}

\end{document}

\documentclass{article}
\usepackage{polyglossia}
\usepackage{bidi} % For older systems

\setdefaultlanguage{english}
\setotherlanguage{arabic}
\setotherlanguage{hebrew}

\usepackage{fontspec}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2]{Scheherazade}
\newfontfamily\hebrewfont[Script=Hebrew,Scale=1.1]{David CLM}

\begin{document}

\section{Bidirectional Text Support}

This is left-to-right English text.

\begin{arabic}
\subsection{النص العربي}
هذا نص من اليمين إلى اليسار. يمكن مزج \textLR{English words} في النص العربي.

\begin{itemize}
    \item البند الأول
    \item البند الثاني مع \textLR{LTR text}
    \item البند الثالث
\end{itemize}
\end{arabic}

Mixed paragraph: The Arabic phrase \textarabic{السلام عليكم} means
"peace be upon you" and the Hebrew \texthebrew{שלום} means "peace/hello".

\begin{hebrew}
\subsection{טקסט עברי}
זהו טקסט מימין לשמאל בעברית. אפשר לשלב \textLR{English} בתוך העברית.
\end{hebrew}

% Tables with RTL text
\begin{table}[h]
\centering
\begin{tabular}{|c|c|c|}
\hline
English & \textarabic{عربي} & \texthebrew{עברית} \\
\hline
Hello & \textarabic{مرحبا} & \texthebrew{שלום} \\
Goodbye & \textarabic{وداعا} & \texthebrew{להתראות} \\
Thank you & \textarabic{شكرا} & \texthebrew{תודה} \\
\hline
\end{tabular}
\caption{Multilingual greetings}
\end{table}

\end{document}

\documentclass{article}
\usepackage{fontspec} % XeLaTeX/LuaLaTeX
\usepackage{polyglossia}

\setdefaultlanguage{english}
\setotherlanguages{russian, greek, japanese, arabic}

% Main document fonts
\setmainfont[
    Ligatures=TeX,
    BoldFont={* Bold},
    ItalicFont={* Italic},
    BoldItalicFont={* Bold Italic}
]{TeX Gyre Termes}

\setsansfont[
    Ligatures=TeX,
    Scale=0.9
]{TeX Gyre Heros}

\setmonofont[
    Scale=0.9
]{Inconsolata}

% Language-specific fonts
\newfontfamily\russianfont[
    Script=Cyrillic,
    Ligatures=TeX
]{PT Serif}

\newfontfamily\greekfont[
    Script=Greek,
    Ligatures=TeX
]{GFS Artemisia}

\newfontfamily\japanesefont[
    Script=CJK,
    Scale=0.9
]{Noto Sans CJK JP}

\newfontfamily\arabicfont[
    Script=Arabic,
    Scale=1.2,
    RightToLeft=true
]{Scheherazade}

\begin{document}

\section{Font Configuration for Multiple Languages}

Default English text uses TeX Gyre Termes.

\begin{russian}
Русский текст использует шрифт PT Serif, который хорошо поддерживает кириллицу.
\end{russian}

\begin{greek}
Το ελληνικό κείμενο χρησιμοποιεί τη γραμματοσειρά GFS Artemisia.
\end{greek}

\begin{japanese}
日本語のテキストはNoto Sans CJK JPフォントを使用します。
\end{japanese}

\begin{arabic}
النص العربي يستخدم خط Scheherazade مع دعم كامل للغة العربية.
\end{arabic}

\end{document}

\documentclass{article}
\usepackage{fontspec}

% Font with various OpenType features
\setmainfont[
    Numbers={OldStyle,Proportional},
    Ligatures={Common,Contextual,Historic},
    Letters=SmallCaps,
    Style=Alternate
]{EB Garamond}

% Define font variations
\newfontfamily\liningfont[Numbers={Lining,Monospaced}]{EB Garamond}
\newfontfamily\swashfont[Style=Swash,Contextuals=Swash]{EB Garamond}
\newfontfamily\historicfont[Style=Historic,Ligatures=Historic]{EB Garamond}

\begin{document}

\section{OpenType Features}

% Number styles
Default oldstyle figures: 0123456789

{\liningfont Lining figures: 0123456789}

% Ligatures
Standard ligatures: ff fi fl ffi ffl

{\addfontfeature{Ligatures=NoCommon}No ligatures: ff fi fl ffi ffl}

% Small caps
\textsc{Small Capitals for Emphasis}

% Swash characters
{\swashfont Swash variants for Q and &}

% Historic forms
{\historicfont Historic long s: distinction}

% Fractions
\addfontfeature{Fractions=On}
Automatic fractions: 1/2 3/4 5/8

\end{document}

\documentclass{article}
\usepackage[utf8]{inputenc} % For pdfLaTeX
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage[english, french, german]{babel}

\begin{document}

\section{Special Characters}

% Direct Unicode input (with utf8)
Café, naïve, Zürich, señor, Москва

% LaTeX commands for special characters
Caf\'e, na\"{\i}ve, Z\"urich, se\~nor

% French special characters
\selectlanguage{french}
\oe uvre, c\oe ur, <<~guillemets~>>

% German special characters
\selectlanguage{german}
"Anf"uhrungszeichen", "=, "~, "`German quotes"'

% Text symbols
\texttrademark{} \textregistered{} \textcopyright{} \texteuro{} \textyen{}

% Accented characters
\`{a} \'{e} \^{o} \~{n} \"{u} \={a} \.{c} \u{g} \v{s} \H{o}

% Special ligatures
\AE{} \ae{} \OE{} \oe{} \AA{} \aa{} \O{} \o{} \L{} \l{} \SS{} \ss{}

\end{document}

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english, german, french]{babel}

\begin{document}

\section{Hyphenation Examples}

% English hyphenation
\selectlanguage{english}
\hyphenation{hy-phen-a-tion ex-am-ple spe-cial-word}

This is a demonstration of hyphenation in English with some 
extraordinarily long words that need proper hyphenation patterns
to break correctly at line endings.

% German hyphenation
\selectlanguage{german}
\hyphenation{Sil-ben-tren-nung Bei-spiel-wör-ter}

Dies ist eine Demonstration der Silbentrennung im Deutschen mit
außergewöhnlich langen Wörtern, die ordnungsgemäße Trennmuster
benötigen.

% French hyphenation
\selectlanguage{french}
\hyphenation{hy-phe-na-tion ex-em-ple}

Ceci est une démonstration de la césure en français avec des mots
extraordinairement longs qui nécessitent des modèles de césure
appropriés.

% Prevent hyphenation
\selectlanguage{english}
\mbox{Unhyphenatable} word or \hbox{compound expression}.

\end{document}

\documentclass{report}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english, spanish, french, german]{babel}
\usepackage{csquotes} % Context-sensitive quotes

% Chapter names in different languages
\addto\captionsenglish{\renewcommand{\chaptername}{Chapter}}
\addto\captionsspanish{\renewcommand{\chaptername}{Capítulo}}
\addto\captionsfrench{\renewcommand{\chaptername}{Chapitre}}
\addto\captionsgerman{\renewcommand{\chaptername}{Kapitel}}

\begin{document}

% Title page in multiple languages
\begin{titlepage}
    \centering
    \vspace*{2cm}
    
    {\Huge\bfseries Multilingual Report\\
    Rapport Multilingue\\
    Informe Multilingüe\\
    Mehrsprachiger Bericht\par}
    
    \vspace{2cm}
    
    {\Large\itshape International Organization\\
    Organisation Internationale\\
    Organización Internacional\\
    Internationale Organisation\par}
    
    \vfill
    
    {\large\today\par}
\end{titlepage}

\tableofcontents

\selectlanguage{english}
\chapter{Introduction}
This report is written in multiple languages...

\selectlanguage{french}
\chapter{Introduction}
Ce rapport est rédigé en plusieurs langues...

\selectlanguage{spanish}
\chapter{Introducción}
Este informe está escrito en varios idiomas...

\selectlanguage{german}
\chapter{Einleitung}
Dieser Bericht ist in mehreren Sprachen verfasst...

\end{document}

\documentclass{article}
\usepackage{polyglossia}
\usepackage{datetime2}

\setdefaultlanguage{english}
\setotherlanguages{french, german, spanish, russian}

\begin{document}

\section{Localized Dates and Numbers}

% Dates in different languages
\begin{tabular}{ll}
English: & \today \\
\French French: & \today \\
\German German: & \today \\
\Spanish Spanish: & \today \\
\Russian Russian: & \today \\
\end{tabular}

% Number formatting
\begin{english}
English: 1,234,567.89
\end{english}

\begin{french}
French: 1 234 567,89
\end{french}

\begin{german}
German: 1.234.567,89
\end{german}

% Ordinal numbers
\begin{english}
1st, 2nd, 3rd, 4th, 21st
\end{english}

\begin{french}
1\textsuperscript{er}, 2\textsuperscript{e}, 
3\textsuperscript{e}, 21\textsuperscript{e}
\end{french}

\begin{spanish}
1\textsuperscript{o}, 2\textsuperscript{o}, 
3\textsuperscript{o}, 21\textsuperscript{o}
\end{spanish}

\end{document}

\documentclass{book}
\usepackage{fontspec} % XeLaTeX
\usepackage{polyglossia}
\usepackage{csquotes}
\usepackage{datetime2}
\usepackage{siunitx}
\usepackage{lipsum}

% Language setup
\setdefaultlanguage[variant=american]{english}
\setotherlanguages{french, german, spanish, russian, arabic, japanese}

% Font configuration
\setmainfont{TeX Gyre Termes}
\setsansfont{TeX Gyre Heros}
\setmonofont{Inconsolata}

% Language-specific fonts
\newfontfamily\russianfont{PT Serif}
\newfontfamily\arabicfont[Script=Arabic]{Amiri}
\newfontfamily\japanesefont{Noto Sans CJK JP}

% Metadata
\title{Multilingual Document Example\\
\large Exemple de Document Multilingue\\
Mehrsprachiges Dokumentbeispiel}
\author{International Author}
\date{\today}

\begin{document}

\frontmatter
\maketitle

\begin{abstract}
This document demonstrates comprehensive multilingual support in LaTeX,
including various scripts, bidirectional text, and localization features.
\end{abstract}

\tableofcontents

\mainmatter

\chapter{Introduction}
\section{English Section}

This document showcases LaTeX's capabilities for handling multiple languages
and scripts within a single document. We'll explore various features including:

\begin{itemize}
    \item Font selection and configuration
    \item Bidirectional text support
    \item Proper hyphenation and line breaking
    \item Localized formatting
    \item Special characters and symbols
\end{itemize}

\section{Section Française}
\begin{french}
Cette section démontre le support du français avec :
\begin{itemize}
    \item Les guillemets français : \enquote{exemple}
    \item Les espaces insécables : voici !
    \item La date : \today
    \item Les nombres : \num{1234567.89}
\end{itemize}
\end{french}

\section{Deutscher Abschnitt}
\begin{german}
Dieser Abschnitt zeigt die deutsche Unterstützung mit:
\begin{itemize}
    \item Deutsche Anführungszeichen: \enquote{Beispiel}
    \item Datum: \today
    \item Zahlen: \num{1234567.89}
    \item Silbentrennung für lange Wörter
\end{itemize}
\end{german}

\chapter{Advanced Features}

\section{Bidirectional Text}
\begin{english}
This chapter includes Arabic text: \textarabic{مرحبا بالعالم} (Hello World)
embedded within English paragraphs.
\end{english}

\begin{arabic}
هذا قسم كامل باللغة العربية. يُظهر الدعم الكامل للنص من اليمين إلى اليسار
مع الخطوط والتنسيق المناسبين. يمكن تضمين \textLR{English text} داخل العربية.
\end{arabic}

\section{Asian Languages}
\begin{japanese}
日本語のサポートも含まれています。これは日本語のテキストの例です。
LaTeXは複雑な文字体系も処理できます。
\end{japanese}

\chapter{Reference Section}

\section{Common Phrases}
\begin{tabular}{llll}
\textbf{English} & \textbf{Français} & \textbf{Deutsch} & \textbf{Español} \\
Hello & Bonjour & Hallo & Hola \\
Thank you & Merci & Danke & Gracias \\
Goodbye & Au revoir & Auf Wiedersehen & Adiós \\
\end{tabular}

\backmatter
\appendix

\chapter{Technical Notes}
This document was compiled with XeLaTeX to support Unicode and
advanced font features. All languages are properly configured with
appropriate hyphenation patterns and typography rules.

\end{document}