add i18n translation support (#156)

* add initial translation

* readd _copy params to templates

i18n/de.toml

+[more]
+other = "Mehr"
+
+[allTitle]
+other = "Alle {{.Title }}"
+
+[recentTitle]
+other = "Neuste {{.Title }}"
+
+[readMore]
+other = "weiterlesen"
+
+[whatsInThis]
+other = "Was ist in dieser {{ .Type }}"
+
+[related]
+other = "Ähnliches"

i18n/en.toml

+[more]
+other = "More"
+
+[allTitle]
+other = "All {{.Title }}"
+
+[recentTitle]
+other = "Recent {{.Title }}"
+
+[readMore]
+other = "read more"
+
+[whatsInThis]
+other = "What's in this {{ .Type }}"
+
+[related]
+other = "Related"

layouts/index.html

       {{/* Use $section_name to get the section title. Use "with" to only show it if it exists */}}
        {{ with .Site.GetPage "section" $section_name }}
           <h1 class="flex-none">
-            {{$.Param "recent_copy" | default "Recent" }} {{ .Title }}
+            {{ $.Param "recent_copy" | default (i18n "recentTitle" .) }}
           </h1>
         {{ end }}
 
 
       {{ if ge $section_count (add $n_posts 1) }}
       <section class="w-100">
-        <h1 class="f3">More</h1>
+        <h1 class="f3">{{ i18n "more" }}</h1>
         {{/* Now, range through the next four after the initial $n_posts items. Nest the requirements, "after" then "first" on the outside */}}
         {{ range (first 4 (after $n_posts $section))  }}
           <h2 class="f5 fw4 mb4 dib mr3">
 
         {{/* As above, Use $section_name to get the section title, and URL. Use "with" to only show it if it exists */}}
         {{ with .Site.GetPage "section" $section_name }}
-          <a href="{{ .URL }}" class="link db f6 pa2 br3 bg-mid-gray white dim w4 tc">All {{.Title }}</a>
+          <a href="{{ .URL }}" class="link db f6 pa2 br3 bg-mid-gray white dim w4 tc">{{ i18n "allTitle" . }}</a>
         {{ end }}
         </section>
       {{ end }}

layouts/partials/menu-contextual.html

 
 {{- if .Params.toc -}}
   <div class="bg-light-gray pa3 nested-list-reset nested-copy-line-height nested-links">
-    <p class="f5 b mb3">What's in this {{ humanize .Type }}</p>
+    <p class="f5 b mb3">{{ i18n "whatsInThis" humanize .Type }}</p>
       {{ .TableOfContents }}
   </div>
 {{- end -}}
 
 {{ with $related }}
   <div class="bg-light-gray pa3 nested-list-reset nested-copy-line-height nested-links">
-    <p class="f5 b mb3">Related</p>
+    <p class="f5 b mb3">{{ i18n "related" }}</p>
     <ul class="pa0 list">
 	   {{ range . }}
 	     <li  class="mb2">

layouts/partials/summary-with-image.html

         <div class="f6 f5-l lh-copy nested-copy-line-height nested-links">
           {{ .Summary }}
         </div>
-          <a href="{{.URL}}" class="ba b--moon-gray bg-light-gray br2 color-inherit dib f7 hover-bg-moon-gray link mt2 ph2 pv1">{{$.Param "read_more_copy" | default "read more" }}</a>
+          <a href="{{.URL}}" class="ba b--moon-gray bg-light-gray br2 color-inherit dib f7 hover-bg-moon-gray link mt2 ph2 pv1">{{ $.Param "read_more_copy" | default (i18n "readMore") }}</a>
         {{/* TODO: add author
         <p class="f6 lh-copy mv0">By {{ .Author }}</p> */}}
       </div>