Add locale string for "Page"

_data/ui-text.yml

@@ -3,6 +3,7 @@
 # English (default)
 # -----------------
 en: &DEFAULT_EN
+  page                : "Page"
   pagination_previous : "Previous"
   pagination_next     : "Next"
   toc_label           : "Overview"

_includes/seo.html

@@ -16,7 +16,7 @@
   {% assign canonical_url = page.url | replace: "index.html", "" | prepend: site.url %}
 {% endif %}
 
-<title>{{ seo_title | default: site.title }}{% if paginator %}{% unless paginator.page == 1 %} {{ site.title_separator }} page {{ paginator.page }}{% endunless %}{% endif %}</title>
+<title>{{ seo_title | default: site.title }}{% if paginator %}{% unless paginator.page == 1 %} {{ site.title_separator }} {{ site.data.ui-text[site.locale].page }} {{ paginator.page }}{% endunless %}{% endif %}</title>
 
 {% assign seo_description = page.description | default: page.excerpt | default: site.description %}
 {% if seo_description %}