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Language localisation[nb 1] is the process of adapting a product that has been previously translated into different languages to a specific country or region (from Latin locus (place) and the English term locale, "a place where something happens or is set"). It is the second phase of a larger process of product translation and cultural adaptation (for specific countries, regions or groups) to account for differences in distinct markets, a process known as internationalization and localization.
Language localization differs from translation activity because it involves a comprehensive study of the target culture in order to correctly adapt the product to local needs. Localization can be referred to by the numeronym L10N (as in: "L", followed by ten more letters, and then "N").
The localization process is most generally related to the cultural adaptation and translation of software, video games, and websites and less frequently to any written translation (which may also involve cultural adaptation processes). Localization can be done for regions or countries where people speak different languages or where the same language is spoken: For instance, different dialects of Spanish, with different idioms, are spoken in Spain than are spoken in Latin America; likewise, word choices and idioms may vary even among countries which share a common language.
The overall process: internationalization, globalization and localization
As the former Localization Industry Standards Association (LISA) explained, globalization "can best be thought of as a cycle rather than a single process". To globalize is to plan the design and development methods for a product in advance, keeping in mind a multicultural audience, in order to avoid increased costs and quality problems, save time, and smooth the localizing effort for each region or country. Localization is an integral part of the overall process called globalization.
There are two primary technical processes that comprise globalization: internationalization and localization.
The first phase, internationalization, encompasses the planning and preparation stages for a product that is built by design to support global markets. This process removes all cultural assumptions, and any country- or language-specific content is stored so that it can be easily adapted. If this content is not separated during this phase, it must be fixed during localization, adding time and expense to the project. In extreme cases, products that were not internationalized may not be localizable.
The second phase, localization, refers to the actual adaptation of the product for a specific market. The localization phase involves, among other things, the four issues LISA describes as linguistic, physical, business and cultural, and technical issues.
At the end of each phase, testing (including quality assurance) is performed to ensure that the product works properly and meets the client's quality expectations.
Translation versus localization
Though it is sometimes difficult to draw the limits between translation and localization, in general localization addresses significant, non-textual components of products or services. In addition to translation (and, therefore, grammar and spelling issues that vary from place to place where the same language is spoken), the localization process might include adapting graphics; adopting local currencies; using proper forms for dates, addresses, and phone numbers according to the location; the choices of colors; and many other details, including rethinking the physical structure of a product. All these changes aim to recognize local sensitivities, avoid conflict with local culture, customs, common habits, and enter the local market by merging into its needs and desires. For example, localization aims to offer country-specific websites of the same company or different editions of a book depending on where it is published.
Globalization versus localization
Whereas localization is the process of adapting one product to a particular locale, globalization designs the product to minimize the extra work required for each localization.
Suppose someone is working for a company that, until now, has operated exclusively in the United States. However, the company is now opening a major office in China and needs a Chinese-language website. The company offers the same products and services in both countries with only some minor differences, but perhaps some of the elements that appeared in the original website targeted at the United States are offensive or upsetting in China (use of flags, colors, nationalistic images, songs, etc.). Thus, that company might lose a potential market because of small details of presentation.
Now, suppose instead that this company has major offices in a dozen countries and needs a specifically designed website in each of these countries. Before deciding how to localize the website and the products offered in any given country, a professional in the area might advise the company to create an overall strategy: to globalize the way the organization does business. The company might want to design a framework to codify and support this global strategy. The globalization strategy and the globalization framework would provide uniform guidance for the twelve separate localization efforts.
Globalization is especially important in mitigating extra work involved in the long-term cycle of localization. Because localization is a cycle and not a one-time project, there will always be new texts, updates, and projects to localize. For example, as the original website is updated over time, each of the localized websites already translated will also need to be updated. This cycle of work is continuous as long as the original project continues to evolve. It is therefore important for globalization processes to be created and streamlined in order to implement ongoing changes.
Language codes are closely related to the localizing process because they indicate the locales involved in the translation and adaptation of the product. They are used in various contexts; for example, they might be informally used in a document published by the European Union or they might be introduced in HTML element under the lang attribute. In the case of the European Union style guide, the language tags are based on the ISO 639-1 alpha-2 code; in HTML, the language codes are generally defined by the Internet Engineering Task Force's Best Current Practice (BCP) 47.[nb 2] The decision to use one type of code or tag versus another depends upon the nature of the project and any requirements set out for the localization specialist.
Most frequently, there is a primary sub-code that identifies the language (e.g., "en") and an optional sub-code, in capital letters, that specifies the national variety (e.g., "GB" or "US"). The sub-codes are typically linked with a hyphen, though in some contexts it's necessary to substitute this with an underscore. 
There are multiple language tag systems available for language codification. For example, the International Organization for Standardization (ISO) specifies both two- and three-letter codes to represent languages in standards ISO 639-1 and ISO 639-2, respectively.
|Language family||ISO 639-1 code||Language variant|
|Spanish||es-ES||Castilian Spanish (as written and spoken in Spain)|
|Portuguese||pt-PT||European Portuguese (as written and spoken in Portugal)|
|Chinese||zh-CN||Mainland China, simplified characters|
|zh-TW||Taiwan, traditional characters|
|zh-HK||Hong Kong, traditional characters|
- "locale". The New Oxford American Dictionary (2nd ed.). Oxford University Press. 2005.
- "What is Globalization?". LISA. Romainmôtier, Switzerland: Localization Industry Standards Association. Retrieved 6 September 2010.
- Chandler, Heather Maxwell (October/November 2008). "Practical skills for video game translators". MultiLingual (Sandpoint, Idaho: MultiLingual Computing).
- Crosignani, Simone; Ballista, Andrea; Minazzi, Fabio (October/November 2008). "Preserving the spell in games localization". MultiLingual (Sandpoint, Idaho: MultiLingual Computing).
- "7.2.1. Order of language versions and ISO codes (multilingual texts)". Interinstitutional style guide. Europa Publications Office. 1 July 2010.
- drepper (18 February 2007). "libc/localedata/SUPPORTED - view - 1.102". sources.redhat.com. Red Hat. Retrieved 6 September 2010. (List of supported locales in the GNU libc library.)
- Internationalization and localization
- American and British English differences
- Spanish dialects and varieties
- Variety (linguistics)
- Globalization and Localization Association (GALA)
- Localization World Conference
- Worldware Conference - Global Software Strategies
- Localisation Research Centre
- Mozilla Localization Project
- 22 Ideas for Better Game Localization - Tips and ideas on how to improve the localization process for video games
- I18nguy: Internationalization (I18n), Localization (L10n), Standards, and Amusements
- Developer Tips for Localizing Texts
- Foreignword - List of translation magazines
- Developing Tips: Language tags
- W3C: Internationalization - Language tags in HTML and XML
- Library of Congress List of ISO 639-2 (alpha 3) Language Codes