Multilingual strings storage

This project demonstrates different ways to store multilingual strings for dynamic data

Problem

Efficient storage of language sensitive data, including:

• Insertion
• Selection
• Updating
• Deletion
• Add new language
• Add new language sensitive data

For instance, user profile details with language sensitive data such as first, second and middle name. Name can be spelled differently in different languages.
Name Alexander spelling varies:

Language	Spelling
en	Alexander
be	Аляксандр
ru	Александр
ko	알렉산드로스

Another example is a localized product name for international manufacturers.
Name Mitsubishi Pajero spelling varies:

Language	Spelling
en	Mitsubishi Pajero
es	Mitsubishi Montero
ja	三菱・パジェロ

Main approaches

There are two wide known approaches:

1. Store language specific data in the same table
2. Store language specific in the auxiliary table
   • one extension table
   • extension table for each multilingual attribute
   • shared extension table for all multilingual data (with surrogate key)

Store language specific data in the same table

Table account

Field	Type
id	int - primary key
first_name_en	nvarchar
first_name_ru	nvarchar
second_name_en	nvarchar
second_name_ru	nvarchar
other language-specific fields
other language-neutral fields

Store language specific in the auxiliary table

Extension table for parent table

Table account

Field	Type
id	int - primary key
other language-neutral fields

Table account_translations

Field	Type
id	int - foreign key to account table
language	varchar (e.g. "en", "ru")
first_name	nvarchar
second_name	nvarchar
other language-specific fields

Extension table for parent table for each attribute

Table account

Field	Type
id	int - primary key
other language-neutral fields

Table account_first_name_translations

Field	Type
id	int - foreign key to account table
language	varchar (e.g. "en", "ru")
translation	nvarchar

Table account_second_name_translations

Field	Type
id	int - foreign key to account table
language	varchar (e.g. "en", "ru")
translation	nvarchar

A shared table for all translatable fields of all tables

Table account

Field	Type
id	int - primary key
first_name	int - foreign key to localized_text table
second_name	int - foreign key to localized_text table
other language-neutral fields

Table localized_text

Field	Type
id	int - primary key

Table translations

Field	Type
id	int - foreign key to localized_text table
language	varchar (e.g. "en", "ru")
translation	nvarchar