This reverts commit f0fc8d792b35ec3b5f76aaf5cf8f4d82707b939c.

update pot file
remove transifex configuration
remove es_ES files/folder/config as es exists

When clicking the close button on a notification, the D-Bus signal
incorrectly sent reason=1 (expired) instead of reason=2 (dismissed).

Fixed by setting a flag on the notification window in the close button
callback before destroying it, and checking this flag in the callback to
send the correct close reason.

Fixes #129

Change icon resolution to separate if clauses. This allows each fallback
method to attempt icon loading regardless of whether previous parameters
were provided but failed to resolve.

For example, previously if an application provided an empty or invalid
icon parameter, the daemon would skip all other checks and no icon would
be resolved, even if the other checks would have succeeded in resolving
an icon.

When a notification provides an app_name but no explicit icon, attempt
to derive the application icon from the desktop entry as a fallback
mechanism.