Bug fix for translation class, DB IO connection error set fix

- The translation file reader did an isset on a set variable insetad of
checking if the variable is zero and so never started the translation
system
- The DB IO connection not set was wrongly set. If the connection failed
it is not TRUE and else FALSE. There is a new internal method
getConnectionStatus to query this status it returns TRUE/FALSE depending
if the connection failed

- Update the l10n test page with proper translation tests
  - init OK
  - show current lang/file
  - translation test
  - switch language test

4dev/lang/admin/messages_en_utf8.po

@@ -1,11 +1,11 @@
-#********************************************************************
+# ********************************************************************
 # AUTHOR: Clemens Schwaighofer
 # CREATED: 2005/08/09
 # SHORT DESCRIPTION:
 # Backned English Messages file for gettext
 # to craete: msgfmt -o ja.mo messages_en.po
 # HISTORY:
-#********************************************************************/
+# ********************************************************************/
 
 msgid ""
 msgstr ""
@@ -24,3 +24,6 @@ msgstr "Year"
 
 msgid "Month"
 msgstr "Month"
+
+msgid "INPUT TEST"
+msgstr "OUTPUT TEST EN"

4dev/lang/admin/messages_ja_utf8.po

@@ -1,11 +1,11 @@
-#********************************************************************
+# ********************************************************************
 # AUTHOR: Clemens Schwaighofer
 # CREATED: 2018/03/28
 # SHORT DESCRIPTION:
 # Backend Japanese Messages file for gettext
 # to craete: msgfmt -o ja.mo messages_ja.po
 # HISTORY:
-#********************************************************************/
+# ********************************************************************/
 
 msgid ""
 msgstr ""
@@ -61,3 +61,6 @@ msgstr "土"
 
 msgid "Sun"
 msgstr "日"
+
+msgid "INPUT TEST"
+msgstr "OUTPUT TEST JA"