Author: David Monllao
MDL-50661 theme_clean: New small logo setting
Introduces new settings to set a small logo in the navbar next
to the site name on pages where the logo is not displayed.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c08b52aa74c8f20b115d5d57e38312bc93cc25a2
http://github.com/moodle/moodle/commit/c08b52aa74c8f20b115d5d57e38312bc93cc25a2
+ 3.1 en [sitelogo,theme_clean]
+ 3.1 en [sitename,theme_clean]
+ 3.1 en [sitenamedesc,theme_clean]
+ 3.1 en [smalllogo,theme_clean]
+ 3.1 en [smalllogodesc,theme_clean]