Notification of string changes

Author: Huong Nguyen
MDL-82627 AI: Rename TinyMCE placement to a more generic name
To make the plugin name a bit more generic, we renamed as below
- Shortname: `aiplacement_tinymce` -> `aiplacement_editor`
- Fullname: `TinyMCE Editor Placement` -> HTML Text Editor Placement


http://git.moodle.org/gw?p=moodle.git;a=commit;h=7809ad9d9695e96488365525cd9201c20e5209d4
http://github.com/moodle/moodle/commit/7809ad9d9695e96488365525cd9201c20e5209d4

+ 4.5 en [accept,aiplacement_editor]
+ 4.5 en [cancelai,aiplacement_editor]
+ 4.5 en [generatecontent,aiplacement_editor]
+ 4.5 en [generateimage,aiplacement_editor]
+ 4.5 en [generateimagesetting,aiplacement_editor]
+ 4.5 en [generateimagesetting_desc,aiplacement_editor]
+ 4.5 en [generatetext,aiplacement_editor]
+ 4.5 en [generatetextsetting,aiplacement_editor]
+ 4.5 en [generatetextsetting_desc,aiplacement_editor]
+ 4.5 en [pluginname,aiplacement_editor]
+ 4.5 en [privacy:metadata,aiplacement_editor]
+ 4.5 en [editor:generate_image,aiplacement_editor]
+ 4.5 en [editor:generate_text,aiplacement_editor]