Fix sharing error message - id -> file name

fixe #2827
added stripped library php-opencloud (version 1.6.0)
adjustment of the configuration parameters
adapted existing test cases
renaming OC\Files\Storage\SWIFT to OC\Files\Storage\Swift
rewrite of OC\Files\Storage\Swift
make Swift::testLocal workable by fixing the prefix used with the object listing in opendir
Revert "make Swift::testLocal workable by fixing the prefix used with the object listing in opendir"

This reverts commit b92061da5ab2d11f803731628c4304aa8cd302e3.
make Swift::testLocal workable by using a delimiter
Correct indentation for default language.
Fix coding style for else.
Better variable names.
Apply substring on the correct value.
Sort, so 'de' is preferred over 'de_DE' when performing non-exact matching.
Have to also strtolower() on available language name. Otherwise no match.
Some tests for OC_L10N::findLanguage()
Merge branch 'master' into fix-sharing-code
pass the name of the item source from the browser to the server - no need to get the data via complicated db queries
fixing PHPDoc & grammar
add configuration parameter to manually set the timeout of HTTP requests