Search notes:

/etc/locale.gen

/etc/locale.gen contains the locale definitions and system languages.
Every line that does not begin with a # is treated as a locale definition to be built by the shell script /usr/bin/locale-gen. This script reads locale.gen and invokes localedef for the chosen localisation profiles and places the generated locales in /usr/lib/locale.
The format of uncommented lines in the file is <locale-name> <charset>, for example 
en_US.UTF-8 UTF-8
de_CH.UTF-8 UTF-8

See also

/etc/default/locale
locale
The vim error message E197: Cannot set language to "en_US.UTF-8"

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Linux/fh...', 1788345170, '216.73.217.21', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Linux/fhs/etc/locale_gen(50): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78