♻️ Major code restructuring

src/locale/en-US/base.ftl

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+# Branding component.
+site_home = Home
+
+# PoweredBy component.
+poweredby_pagetop = Powered by {$pagetop_link}
+pagetop_logo = PageTop logo
+
+# Menu component.
+menu_toggle = Toggle menu visibility
+
+# Form components.
+button_submit = Submit
+button_reset = Reset

src/locale/en-US/theme.ftl

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+header = Header
+pagetop = Page Top
+content = Content
+sidebar = Sidebar
+footer = Footer
+
+skip_to_content = Skip to main content (Press Enter)

src/locale/es-ES/base.ftl

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+# Branding component.
+site_home = Inicio
+
+# PoweredBy component.
+poweredby_pagetop = Funciona con {$pagetop_link}
+pagetop_logo = Logotipo de PageTop
+
+# Menu component.
+menu_toggle = Alternar visibilidad del menú
+
+# Form components.
+button_submit = Enviar
+button_reset = Reiniciar

src/locale/es-ES/theme.ftl

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+header = Cabecera
+pagetop = Superior
+content = Contenido
+sidebar = Barra lateral
+footer = Pie
+
+skip_to_content = Ir al contenido principal (Pulsar Intro)