feat: i18n (#182)

* build: add vue-i18n dependency

* feat: add i18n plugin to vue project

* feat: use translations in play button

* feat: translate play view

* feat: translate menu items

* feat: translate local mods view

* feat: translate online mods view

* feat: translate mods menu

* feat: translate thunderstore mod card component

* fix: remove useless "this" keyword

* feat: translate settings view

* fix: remove leftover test invocation

* feat: add language selector component

* feat: using language selector updates interface's language

* feat: save language in persistent store on selector change

* feat: initialize lang on app launch

* refactor: move i18n code into App.mounted callback

* feat: update interface language on app launch

* feat: adjust language selection on language selector load

* fix: this.$root can't be null

* feat: translate store notifications

* fix: add missing parameter to english translation

* feat: translate "by" author keyword

* feat: translate repair window

* feat: translate repair window title

* docs: add some documentation regarding localization

* docs: explain how to add a new language

* feat: translate Northstar release canal selector elements

* docs: describe how to inject variable into translations

* feat: translate "info" word

* feat: translate popconfirm buttons

* fix: remove "this" keyword

* fix: save store when updating interface language

2 files changed, 312 insertions, 0 deletions

diff --git a/src-vue/src/i18n/lang/en.ts b/src-vue/src/i18n/lang/en.ts
new file mode 100644
index 00000000..14d744f9
--- /dev/null
+++ b/src-vue/src/i18n/lang/en.ts
@@ -0,0 +1,156 @@
+export default {
+    menu: {
+        play: 'Play',
+        changelog: 'Changelog',
+        mods: 'Mods',
+        settings: 'Settings',
+        dev: 'Dev'
+    },
+
+    generic: {
+        yes: 'Yes',
+        no: 'No',
+        error: 'Error',
+        cancel: 'Cancel',
+        informationShort: 'Info'
+    },
+
+    play: {
+        button: {
+            northstar_is_running: 'Game is running',
+            select_game_dir: 'Select Titanfall2 game folder',
+            install: 'Install',
+            installing: 'Installing...',
+            update: 'Update',
+            updating: 'Updating...',
+            ready_to_play: 'Launch game'
+        },
+
+        unknown_version: "Unknown version",
+        see_patch_notes: "see patch notes",
+        players: "players",
+        servers: "servers",
+        unable_to_load_playercount: "Unable to load playercount",
+        northstar_running: "Northstar is running:",
+        origin_running: "Origin is running:"
+    },
+
+    mods: {
+        local: {
+            no_mods: "No mods were found.",
+            delete_confirm: "Are you sure to delete this mod?",
+            delete: "Delete",
+            part_of_ts_mod: "This Northstar mod is part of a Thunderstore mod",
+            success_deleting: "Success deleting {modName}"
+        },
+
+        online: {
+            no_match: "No matching mod has been found.",
+            try_another_search: "Try another search!"
+        },
+
+        menu: {
+            local: 'Local',
+            online: 'Online',
+            filter: 'Filter',
+            search: 'Search',
+            sort_mods: 'Sort mods',
+            select_categories: 'Select categories',
+
+            sort: {
+                name_asc: 'By name (A to Z)',
+                name_desc: 'By name (Z to A)',
+                date_asc: 'By date (from oldest)',
+                date_desc: 'By date (from newest)',
+                most_downloaded: "Most downloaded",
+                top_rated: "Top rated"
+            }
+        },
+
+        card: {
+            button: {
+                being_installed: "Installing...",
+                being_updated: "Updating...",
+                installed: "Installed",
+                install: "Install",
+                outdated: "Update"
+            },
+
+            by: "by",
+            more_info: "More info",
+            remove: "Remove mod",
+            remove_dialog_title: "Warning",
+            remove_dialog_text: "Delete Thunderstore mod?",
+            remove_success: "Removed {modName}",
+            install_success: "Installed {modName}"
+        }
+    },
+
+    settings: {
+        manage_install: "Manage installation",
+        choose_folder: "Choose installation folder",
+        nb_ts_mods_per_page: "Number of Thunderstore mods per page",
+        nb_ts_mods_per_page_desc1: "This has an impact on display performances when browsing Thunderstore mods.",
+        nb_ts_mods_per_page_desc2: "Set this value to 0 to disable pagination.",
+        nb_ts_mods_reset: "Reset to default",
+        language: 'Language',
+        language_select: "Select your favorite language",
+        about: "About:",
+        flightcore_version: "FlightCore version:",
+        testing: "Testing:",
+        enable_test_channels: "Enable testing release channels",
+        dev_mode_enabled_title: "Watch out!",
+        dev_mod_enabled_text: "Developer mode enabled.",
+
+        repair: {
+            title: "Repair",
+            open_window: "Open repair window",
+
+            window: {
+                title: "FlightCore repair window",
+                warning: "This window contains various functionality to repair common issues with Northstar and FlightCore.",
+                disable_all_but_core: "Disable all but core mods",
+                force_reinstall_ns: "Force reinstall Northstar",
+                force_delete_temp_dl: "Force delete temp download folder",
+                delete_persistent_store: "Delete FlightCore persistent store"
+            }
+        }
+    },
+
+    notification: {
+        game_folder: {
+            new: {
+                title: "New game folder",
+                text: "Game folder was successfully updated."
+            },
+
+            wrong: {
+                title: "Wrong folder",
+                text: "Selected folder is not a valid Titanfall2 install."
+            },
+
+            not_found: {
+                title: "Titanfall2 not found!",
+                text: "Please manually select install location"
+            }
+        },
+
+        flightcore_outdated: {
+            title: "FlightCore outdated!",
+            text: "Please update FlightCore.\nRunning outdated version {oldVersion}.\nNewest is {newVersion}!"
+        }
+    },
+
+    channels: {
+        release: {
+            switch: {
+                text: 'Switched release channel to "{canal}".'
+            }
+        },
+
+        names: {
+            Northstar: 'Northstar',
+            NorthstarReleaseCandidate: 'Northstar release candidate'
+        }
+    }
+};
diff --git a/src-vue/src/i18n/lang/fr.ts b/src-vue/src/i18n/lang/fr.ts
new file mode 100644
index 00000000..f1eba0da
--- /dev/null
+++ b/src-vue/src/i18n/lang/fr.ts
@@ -0,0 +1,156 @@
+export default {
+    menu: {
+        play: 'Jouer',
+        changelog: 'Notes',
+        mods: 'Mods',
+        settings: 'Paramètres',
+        dev: 'Dev'
+    },
+
+    generic: {
+        yes: 'Oui',
+        no: 'Non',
+        error: 'Erreur',
+        cancel: 'Annuler',
+        informationShort: 'Info'
+    },
+
+    play: {
+        button: {
+            northstar_is_running: "En cours d'utilisation",
+            select_game_dir: 'Sélectionner le dossier du jeu',
+            install: 'Installer',
+            installing: 'Installation...',
+            update: 'Mettre à jour',
+            updating: 'Mise à jour...',
+            ready_to_play: 'Jouer'
+        },
+
+        unknown_version: "Version inconnue",
+        see_patch_notes: "voir les notes de version",
+        players: "joueurs",
+        servers: "serveurs",
+        unable_to_load_playercount: "Impossible de charger les statistiques",
+        northstar_running: "Northstar est en cours d'exécution :",
+        origin_running: "Origin est en cours d'exécution :"
+    },
+
+    mods: {
+        local: {
+            no_mods: "Aucun mod trouvé.",
+            delete_confirm: "Êtes-vous certain de vouloir supprimer ce mod ?",
+            delete: "Supprimer",
+            part_of_ts_mod: "Ce mod Northstar fait partie d'un mod Thunderstore",
+            success_deleting: "Succès de la suppression de {modName}"
+        },
+
+        online: {
+            no_match: "Aucun mod correspondant n'a été trouvé.",
+            try_another_search: "Essayez une autre recherche !"
+        },
+
+        menu: {
+            local: 'Local',
+            online: 'En ligne',
+            filter: 'Filtrer',
+            search: 'Chercher',
+            sort_mods: 'Trier les mods',
+            select_categories: 'Choisir les catégories',
+
+            sort: {
+                name_asc: 'Par nom (de A à Z)',
+                name_desc: 'Par nom (de Z à A)',
+                date_asc: 'Par date (du plus vieux)',
+                date_desc: 'Par date (du plus récent)',
+                most_downloaded: "Plus téléchargés",
+                top_rated: "Mieux notés"
+            }
+        },
+
+        card: {
+            button: {
+                being_installed: "Installation...",
+                being_updated: "Mise à jour...",
+                installed: "Installé",
+                install: "Installer",
+                outdated: "Mettre à jour"
+            },
+
+            by: "par",
+            more_info: "Plus d'informations",
+            remove: "Supprimer le mod",
+            remove_dialog_title: "Attention !",
+            remove_dialog_text: "Voulez-vous vraiment supprimer ce mod Thunderstore ?",
+            remove_success: "{modName} supprimé",
+            install_success: "{modName} installé"
+        }
+    },
+
+    settings: {
+        manage_install: "Gérer l'installation",
+        choose_folder: "Choisir le dossier d'installation du jeu",
+        nb_ts_mods_per_page: "Nombre de mods Thunderstore par page",
+        nb_ts_mods_per_page_desc1: "Ce paramètre a un impact sur les performances d'affichage des mods Thunderstore.",
+        nb_ts_mods_per_page_desc2: "Réglez-le sur 0 pour désactiver la pagination.",
+        nb_ts_mods_reset: "Valeur par défaut",
+        language: 'Langue',
+        language_select: "Sélectionnez votre langue",
+        about: "À propos:",
+        flightcore_version: "Version de FlightCore :",
+        testing: "Tests :",
+        enable_test_channels: "Activer le test de versions de pré-production",
+        dev_mode_enabled_title: "Attention !",
+        dev_mod_enabled_text: "Mode développeur activé.",
+
+        repair: {
+            title: "Dépannage",
+            open_window: "Ouvrir la fenêtre de dépannage",
+
+            window: {
+                title: "Fenêtre de dépannage FlightCore",
+                warning: "Cette fenêtre contient plusieurs fonctionnalité de résolution de problèmes courants avec Northstar et FlightCore.",
+                disable_all_but_core: "Désactiver tous les mods (sauf ceux de Northstar)",
+                force_reinstall_ns: "Forcer la réinstallation de Northstar",
+                force_delete_temp_dl: "Supprimer le dossier de téléchargement temporaire",
+                delete_persistent_store: "Supprimer l'espace de stockage local de FlightCore"
+            }
+        }
+    },
+
+    notification: {
+        game_folder: {
+            new: {
+                title: "Nouveau dossier",
+                text: "Le dossier du jeu a bien été mis à jour."
+            },
+
+            wrong: {
+                title: "Mauvais dossier",
+                text: "Le dossier sélectionné ne contient pas d'installation de Titanfall2."
+            },
+
+            not_found: {
+                title: "Titanfall2 non trouvé",
+                text: "Veuillez sélectionner manuellement le dossier du jeu."
+            }
+        },
+
+        flightcore_outdated: {
+            title: "Mise à jour disponible !",
+            text: "Veuillez mettre à jour FlightCore.\nVersion actuelle : {oldVersion}.\nNouvelle version : {newVersion}."
+        }
+    },
+
+    channels: {
+        release: {
+            switch: {
+                text: 'Le canal de téléchargement a été réglé sur "{canal}".'
+            }
+        },
+
+        names: {
+            Northstar: 'Northstar',
+            NorthstarReleaseCandidate: 'Version de pré-release'
+        }
+    }
+};