Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-cfs-worker/api.md

@@ -0,0 +1,38 @@
+## cfs-worker Public API ##
+
+CollectionFS, file worker - handles file copies/versions
+
+_API documentation automatically generated by [docmeteor](https://github.com/raix/docmeteor)._
+
+TODO: Use power queue to handle throttling etc.
+Use observe to monitor changes and have it create tasks for the power queue
+to perform.
+-
+
+### <a name="FS.FileWorker"></a>*fs*.FileWorker Object&nbsp;&nbsp;<sub><i>Server</i></sub> ###
+
+*This property __FileWorker__ is defined in `FS`*
+
+
+> ```FS.FileWorker = { ...``` [fileWorker.js:9](fileWorker.js#L9)
+
+
+-
+
+### <a name="FS.FileWorker.observe"></a>*fsFileworker*.observe(fsCollection)&nbsp;&nbsp;<sub><i>Server</i></sub> ###
+
+*This method __observe__ is defined in `FS.FileWorker`*
+
+__Arguments__
+
+* __fsCollection__ *{[FS.Collection](#FS.Collection)}*  
+
+__Returns__  *{undefined}*
+
+
+Sets up observes on the fsCollection to store file copies and delete
+temp files at the appropriate times.
+
+> ```FS.FileWorker.observe = function(fsCollection) { ...``` [fileWorker.js:20](fileWorker.js#L20)
+
+