The Collaborative International Dictionary of English v.0.48:

localisation \localisation\ n.
   Same as localization. [Chiefly Brit.]

   Syn: Syn. --, location, locating, fix.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

localisation
    n 1: (physiology) the principle that specific functions have
         relatively circumscribed locations in some particular part
         or organ of the body [syn: localization of function,
         localisation of function, localization principle,
         localisation principle, localization, localisation]
    2: a determination of the place where something is; "he got a
       good fix on the target" [syn: localization, localisation,
       location, locating, fix]

The Free On-line Dictionary of Computing (30 December 2018):

localisation
l10n
localised

    (l10n) Adapting a product to meet the language,
   cultural and other requirements of a specific target market
   "locale".

   Localisation includes the translation of the user interface,
   on-line help and documentation, and ensuring the images
   and concepts are culturally appropriate and sensitive.  There
   may be subtle cross-cultural considerations, e.g. do the icons
   make sense in other parts of the world?

   Internationalisation is the process that occurs during
   application development that makes localisation easier by
   separating the details that differ between locales from the
   rest of the program that stays the same.  If
   internationalisation is thorough, localisation will require no
   programming.

   The abbreviation l10n means "L - 10 letters - N".

   (1999-06-09)