Massive Decks v2.4.0

Change log:
- Localization: Add German language localizations.
- Feature: Allow spectators to like plays. (#102)
- Feature: Allow liking plays once the round is completed.
- Bugfix: Don't hide "Pick 1" when there is slot repetition. (#152)
- Bugfix: Ensure default decks from server configuration are added to games. (#120)
- Bugfix: Allow for decks with languages we don't know about using a fallback.
- Bugfix: Ensure discarded cards don't stay in the player's pick, causing bugs. (#155)
- Bugfix: Workaround for an issue where browsers can offer excessive numbers of TTS voices, which caused slowdowns in rare cases.
- Bugfix: Capitalise cards correctly. (#167)
- Bugfix: Fix bug where casting failed to load. (#169)
- Refactor: Improved the way localization works for plurals.