feat(frontend/api): i18n support

src/i18n/locale/en.json

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+{
+  "components.Discover.popularmovies": "Popular Movies",
+  "components.Discover.populartv": "Popular Series",
+  "components.Discover.recentrequests": "Recent Requests",
+  "components.Layout.LanguagePicker.changelanguage": "Change Language",
+  "components.MovieDetails.budget": "Budget",
+  "components.MovieDetails.cast": "Cast",
+  "components.MovieDetails.originallanguage": "Original Language",
+  "components.MovieDetails.overview": "Overview",
+  "components.MovieDetails.releasedate": "Release Date",
+  "components.MovieDetails.revenue": "Revenue",
+  "components.MovieDetails.runtime": "{minutes} minutes",
+  "components.MovieDetails.status": "Status",
+  "components.MovieDetails.userrating": "User Rating"
+}

src/i18n/locale/ja.json

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+{
+  "components.Discover.popularmovies": "人気映画",
+  "components.Discover.populartv": "人気テレビ番組",
+  "components.Discover.recentrequests": "最近のリクエスト",
+  "components.Layout.LanguagePicker.changelanguage": "言語",
+  "components.MovieDetails.budget": "興行収入",
+  "components.MovieDetails.cast": "キャスト",
+  "components.MovieDetails.originallanguage": "言語",
+  "components.MovieDetails.overview": "ストーリー",
+  "components.MovieDetails.releasedate": "公開日",
+  "components.MovieDetails.revenue": "製作費",
+  "components.MovieDetails.runtime": "{minutes}分",
+  "components.MovieDetails.status": "状態",
+  "components.MovieDetails.userrating": "ユーザー評価"
+}