Automatic merge of translations from Transifex

internet/podcasts: Fix crash when updating podcasts.

When a podcast is updated and the number of visible items is set in the
podcast settings, child items that disappear from the view, and are
deleted, are still referenced by the database id map.

Move the removal code from SubscriptionRemoved to a common method and
use that for this case.

Automatic merge of translations from Transifex

Rename multiple files to match the application ID

The desktop entry file, appdata file and installed icons are renamed to
match the application ID for the benefit of Flatpak packaging.

Automatic merge of translations from Transifex

Automatic merge of translations from Transifex

Search song from Spotify via web api

Automatic merge of translations from Transifex

Automatic merge of translations from Transifex

Replace Q_ENUMS with Q_ENUM

Q_ENUMS is obsolete. See: https://doc.qt.io/qt-5/qobject-obsolete.html
The replacement is Q_ENUM which was introduced in Qt 5.5, and Clementine
requires Qt 5.6.