Looking in the KDE4 configuration System Settings page Locale > Languages. Only American English is offered as an option in the left hand Available Languages box.
I was interested in adding English language to the list of preferred Languages in the right hand box.
Hovering over the left hand Available Languages only installed language shows the message
This is the list of installed KDE workspace language translations not currently being used. To use a language translation move it to the preferred languages list in the order of preference. If no suitable languages are listed then you may need to install more language packages using your usual installation method.
To get a list of the available language packages use
apt-cache search ^kde-l10n
The table below shows the package name, along with the language
| Package | Lanuage Localisation |
|---|---|
| kde-l10n-ar | Arabic (ar) |
| kde-l10n-bg | Bulgarian (bg) |
| kde-l10n-bs | Bosnian (bs) |
| kde-l10n-ca | Catalan (ca) |
| kde-l10n-cavalencia | Southern Catalan (Valencian) |
| kde-l10n-cs | Czech (cs) |
| kde-l10n-da | Danish (da) |
| kde-l10n-de | German (de) |
| kde-l10n-el | Greek (el) |
| kde-l10n-engb | British English (en_GB) |
| kde-l10n-es | Spanish (es) |
| kde-l10n-et | Estonian (et) |
| kde-l10n-eu | Basque (eu) |
| kde-l10n-fa | Farsi (fa) |
| kde-l10n-fi | Finnish (fi) |
| kde-l10n-fr | French (fr) |
| kde-l10n-ga | Irish Gaelic (ga) |
| kde-l10n-gl | Galician (gl) |
| kde-l10n-he | Hebrew (he) |
| kde-l10n-hi | Hindi (hi) |
| kde-l10n-hr | Croatian (hr) |
| kde-l10n-hu | Hungarian (hu) |
| kde-l10n-ia | Interlingua (ia) |
| kde-l10n-is | Icelandic (is) |
| kde-l10n-it | Italian (it) |
| kde-l10n-ja | Japanese (ja) |
| kde-l10n-kk | Kazakh (kk) |
| kde-l10n-km | Khmer (km) |
| kde-l10n-ko | Korean (ko) |
| kde-l10n-lt | Lithuanian (lt) |
| kde-l10n-lv | Latvian (lv) |
| kde-l10n-mr | Marathi (mr) |
| kde-l10n-nb | Norwegian Bookmal (nb) |
| kde-l10n-nds | Low Saxon (nds) |
| kde-l10n-nl | Dutch (nl) |
| kde-l10n-nn | Norwegian Nynorsk (nn) |
| kde-l10n-pa | Punjabi (pa) |
| kde-l10n-pl | Polish (pl) |
| kde-l10n-pt | Portuguese (pt) |
| kde-l10n-ptbr | Brazilian Portuguese (pt_BR) |
| kde-l10n-ro | Romanian (ro) |
| kde-l10n-ru | Russian (ru) |
| kde-l10n-sk | Slovakian (sk) |
| kde-l10n-sl | Slovenian (sl) |
| kde-l10n-sr | Serbian (sr) |
| kde-l10n-sv | Swedish (sv) |
| kde-l10n-tg | Tajik (tg) |
| kde-l10n-tr | Turkish (tr) |
| kde-l10n-ug | Uygur (ug) |
| kde-l10n-uk | Ukrainian (uk) |
| kde-l10n-vi | Vietnamese (vi) |
| kde-l10n-wa | Walloon (wa) |
| kde-l10n-zhcn | Chinese Simplified (zh_CN) |
| kde-l10n-zhtw | Chinese Traditional (zh_TW) |
To install the English language package I ran apt-get install kde-l10n-engb.
The local package was already installed. However, there was only the one language presented – American English, in the left hand box.
Out of interest I double clicked on this language, transferring it to the right hand box.
There then appeared reference to British English.
Following this further I tried double clicking on the American English language on another computer. This transferred the language between the two boxes, without the British English appearing.
Wondering whether the language package might not be installed I ran
apt-get install kde-l10n-engb
The installation proceeded, showing that the package hadn’t been previously installed.
I closed the Systems Settings window and reopened it, navigating to the languages tab once again. This time British English was shown on the left. I moved it to the right and clicked on Apply.
