1.15:
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 * Load lang with lang api
 * Add Serendpity 2.0+ backend markup
 * Fix inconistencies
 * Added entries_header hook to assign $is_single_entry,
   which else would not be available with custom permalink entries.


1.14.1:
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 * Use serendipity_specialchars


1.14:
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  * Added stricter array check