Add fit page to window reader setting (#323)

* Add fit page to window reader setting

* Renamed option and conditional rendering

* Rename translation key

src/i18n/locale/en.json

@@ -361,7 +361,8 @@
         "reader_type": "Reader type",
         "show_page_number": "Show page number",
         "skip_dup_chapters": "Skip duplicate chapters",
-        "static_navigation": "Static navigation"
+        "static_navigation": "Static navigation",
+        "fit_page_to_window": "Fit page to window"
       },
       "reader_type": {
         "label": {

src/i18n/locale/es.json

@@ -299,7 +299,8 @@
                 "static_navigation": "Navigación Estática",
                 "show_page_number": "Mostrar numero de pagina",
                 "reader_type": "Tipo de Lector",
-                "skip_dup_chapters": "Omitir capítulos duplicados"
+                "skip_dup_chapters": "Omitir capítulos duplicados",
+                "fit_page_to_window": "Ajustar página a la ventana"
             },
             "title": {
                 "default_reader_settings": "Ajustes Defecto del Lector",