setup: add po plugin and dependencies

.gitlab-ci.yml

@@ -1,5 +1,5 @@
 before_script:
-  - sudo apk add git ikiwiki
+  - sudo apk add git ikiwiki po4a perl-yaml-tiny
   - git submodule init
   - git submodule update
 

ikiwiki.setup

@@ -45,6 +45,7 @@ add_plugins:
 - highlight
 - typography
 - sidebar2
+- po
 # plugins to disable
 disable_plugins:
 - htmlscrubber
@@ -403,3 +404,15 @@ global_sidebars:
   - footer
   - footer
   - "*"
+
+# po plugin
+# used to set the "master" language
+po_master_language: en|English
+# po_slave_languages is used to set the list of supported "slave" languages
+po_slave_languages:
+- fr|Français
+# configures what pages are translatable
+po_translatable_pages: 'index or footer or platforms or sidebar'
+# used to decide how internal links should be generated, depending on web server features and site-specific preferences.
+po_link_to: current
+