Adding "since year" and author support to footer (#245)

* Adding target if statements

* adding Tobias Lindberg to CONTRIBUTORS.md

* adding swedish language i18n file

* adding author to footer

* adjusting swedish translation made in fc7d7f62af52d180486d0074691ab3747fb1da07

* adding since year functionality in footer

* adding since which year if statement to footer

* removing unnecessary lines in footer file

* adjusting footer again a little

exampleSite/config.toml

@@ -27,6 +27,7 @@ disqusShortname = "yourdiscussshortname"
 
     hideCredits = false
     hideCopyright = false
+    since = 2019
 
     # Git Commit in Footer, uncomment the line below to enable it.
     commit = "https://github.com/luizdepra/hugo-coder/tree/"

layouts/partials/footer.html

@@ -3,7 +3,14 @@
     {{ with .Site.Params.footercontent | safeHTML }}
       <p>{{.}}</p>
     {{ end }}
-    {{ if not .Site.Params.hideCopyright }} © {{ now.Format "2006" }}{{ end }}
+    {{ if not .Site.Params.hideCopyright }}
+      {{ with .Site.Params.since }}
+        © {{ if lt . now.Year }}{{ . }} - {{ end }}{{ now.Year }}
+      {{ else }}
+        © {{ now.Year }}
+      {{ end }}
+      {{ if .Site.Params.Author }} {{ .Site.Params.Author }} {{ end }}
+    {{ end }}
     {{ if not .Site.Params.hideCredits }}
       {{ if not .Site.Params.hideCopyright }} · {{ end }}
       {{ i18n "powered_by" }} <a href="https://gohugo.io/">Hugo</a> & <a href="https://github.com/luizdepra/hugo-coder/">Coder</a>.