Change name DateForm to DateFormat, complete git-footer.html upgrade

layouts/partials/docs/git-footer.html

@@ -2,8 +2,8 @@
 <div class="align-center book-git-footer {{ if not .GitInfo }}justify-end{{ else }}justify-between{{ end }}">
   {{ with .GitInfo }}
   <div>
-    <a href="{{ $.Site.Params.BookRepo }}/commit/{{ .Hash }}" title='Last modified {{ .AuthorDate.Local.Format "2 January 2 2006 15:04 MST" }} by {{ .AuthorName }}' target="_blank" rel="noopener">
-      <img src="{{ "svg/code-merge.svg" | relURL }}" /> {{ .AuthorDate.Local.Format "Last Modified 2 January 2006 15:04 MST" }}
+    <a href="{{ $.Site.Params.BookRepo }}/commit/{{ .Hash }}" title='Last modified {{ .AuthorDate.Local.Format $.Site.Params.DateFormat }} by {{ .AuthorName }}' target="_blank" rel="noopener">
+      <img src="{{ "svg/code-merge.svg" | relURL }}" /> {{ .AuthorDate.Local.Format $.Site.Params.DateFormat }}
     </a>
   </div>
   {{ end }}

layouts/posts/list.html

@@ -6,7 +6,7 @@
       <a href="{{ .RelPermalink }}">{{ .Title }}</a>
     </h2>
     <h5>
-      <strong>{{ .Date.Format .Site.Params.DateForm }}</strong>
+      <strong>{{ .Date.Format .Site.Params.DateFormat }}</strong>
     </h5>
     <p class="markdown">
       {{- .Summary -}}

layouts/posts/single.html

@@ -2,7 +2,7 @@
 <header>
   <h1>{{ .Title }}</h1>
   <h5>
-    <strong>{{ .Date.Format .Site.Params.DateForm  }}</strong>
+    <strong>{{ .Date.Format .Site.Params.DateFormat  }}</strong>
   </h5>
 </header>
 <article class="markdown">