Add Error UTF-8 Encoding test files with issue #

test/test_files/encoding/UTF-8/Error Detection Single UTF-8 (issue #1848).txt

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+Apache on Windows:
+==================
+
+
+* Which distribution?
+
+apache.org no longer provides Windows binaries. They direct you to other sources.
+
+Candidates:
+  - The Apache Haus (apachehaus.com)
+  - Apache Lounge   (apachelounge.com)
+
+My current favourite is Apache Lounge. Use the distro with the highest Visual C version you can, and that matches the target system architecture.
+
+Prerequisite: Visual C++ Redistributable
+
+
+* Updating:
+
+(Also check for the latest Visual C++ Redistributable)
+
+Précis:
+
+- Build a new folder at same level as production folder, with "_new" suffix
+- Copy as much production data as possible to new folder
+- Stop (old) production
+- Copy remainder of production data to new folder, moving what can't be copied because of space constraints
+- Rename production folder to backup folder (becomes backup)
+- Rename new folder to production folder (becomes production)
+- Start (new) production and test
+

test/test_files/encoding/UTF-8/Error Detection UTF-8 (no Sign) (issue #1852).txt

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+9:30 30/12/2019
+
+Notepad3 is based on code from Florian Balmer's Notepad2 and XhmikosR's Notepad2-mod.
+MiniPath is based on code from Florian Balmer's metapath.
+
+Changes in Notepad3 compared to original Notepad2 😃  
+
+Changes in MiniPath compared to metapath 👍 😃   
+
+Français, Moïse, fêtes, léger, caractères, 
+Año, lección, página, título, cigüeña
+
+Latitude Longitude : 50° 35' 6" nord, 3° 53' 14.3" est
+