refactor: replace "embeddable-player" occurrences to "embed"

app/Config/Routes.php

app/Controllers/EpisodeController.php

...e/Migrations/2017-12-01-160000_add_podcasts_platforms.php

app/Entities/Episode.php

app/Entities/Platform.php

app/Helpers/components_helper.php

app/Language/en/Common.php

app/Language/en/Episode.php

app/Language/en/Podcast.php

app/Language/fr/Common.php

app/Language/fr/Episode.php

app/Language/fr/Podcast.php

app/Models/PlatformModel.php

app/Resources/js/embed.ts

app/Resources/js/modules/ThemePicker.ts

app/Resources/js/modules/play-episode-button.ts

app/Resources/styles/formInputTabs.css

app/Resources/styles/index.css

app/Resources/styles/tabs.css

modules/Admin/Config/Routes.php