refactor: remove i18n labels and centralize in config

Delete multilingual i18n files for UI labels. Add English labels to
params.toml under [labels]. Update 404.html, single.html, and nav.html
to use site.Params.labels instead of i18n.

Signed-off-by: Sped0n <hi@sped0n.com>

layouts/404.html

@@ -2,9 +2,15 @@
   <div class="container">
     {{- partial "nav.html" . -}}
     <article>
-      <p class="error">&#9949; <u>404</u>&nbsp;{{- i18n 404 -}}&nbsp;&#9949;</p>
-      <p class="error">&#9949; <u>404</u>&nbsp;{{- i18n 404 -}}&nbsp;&#9949;</p>
-      <p class="error">&#9949; <u>404</u>&nbsp;{{- i18n 404 -}}&nbsp;&#9949;</p>
+      <p class="error">
+        &#9949; <u>404</u>&nbsp;{{- site.Params.labels.error -}}&nbsp;&#9949;
+      </p>
+      <p class="error">
+        &#9949; <u>404</u>&nbsp;{{- site.Params.labels.error -}}&nbsp;&#9949;
+      </p>
+      <p class="error">
+        &#9949; <u>404</u>&nbsp;{{- site.Params.labels.error -}}&nbsp;&#9949;
+      </p>
     </article>
   </div>
 {{- end -}}

layouts/_default/single.html

@@ -1,10 +1,10 @@
 {{- define "main" -}}
   <div
     class="container"
-    data-next="{{- i18n "next" -}}"
-    data-prev="{{- i18n "prev" -}}"
-    data-close="{{- i18n "close" -}}"
-    data-loading="{{- i18n "loading" -}}"
+    data-next="{{- site.Params.labels.next -}}"
+    data-prev="{{- site.Params.labels.prev -}}"
+    data-close="{{- site.Params.labels.close -}}"
+    data-loading="{{- site.Params.labels.loading -}}"
   >
     {{- with .Content -}}
       <article>

layouts/partials/nav.html

@@ -37,7 +37,7 @@
     {{- with partial "function/getImageSlice.html" . -}}
       {{- $length = len . -}}
     {{- end -}}
-    <span>{{- i18n "threshold" | strings.FirstUpper -}}:</span>
+    <span>{{- site.Params.labels.threshold -}}:</span>
     <span>
       <button class="dec">&#xFF0D;</button>
       <span class="num"></span><span class="num"></span><span class="num"></span