Add Japanese Vertical Support Branch for Tesseract and Ocrmypdf OCR (#2505)

* Add Japanese Vertical Support 
* Adds Japanese Vertical mappings to default configuration.

modules/joex/src/main/resources/reference.conf

@@ -593,13 +593,32 @@ Docpell Update Check
     # To convert image files to PDF files, tesseract is used. This
     # also extracts the text in one go.
     tesseract = {
+    # Custom Language Mappings Below
+    # Japanese Vertical Mapping
+    arg-mappings = {
+      "tesseract_lang" = {
+        value = "{{lang}}"
+        mappings = [
+          {
+            matches = "jpn_vert"
+            args = [ "-l", "jpn_vert", "-c", "preserve_interword_spaces=1" ]
+          },
+        # Start Other Custom Language Mappings Here
+        # Default Mapping Below
+          {
+            matches = ".*"
+            args = [ "-l", "{{lang}}" ] 
+          }
+        ]
+      }
+    }
       command = {
         program = "tesseract"
+        # Default arguments for all processing go below.
         args = [
           "{{infile}}",
           "out",
-          "-l",
-          "{{lang}}",
+          "{{tesseract_lang}}",
           "pdf",
           "txt"
         ]
@@ -648,11 +667,32 @@ Docpell Update Check
     # (where ocr is not necessary). In this case, the pdf will be
     # converted to PDF/A.
     ocrmypdf = {
+    # Custom argument mappings for this program.
+    arg-mappings = {
+      "ocr_lang" = {
+        value = "{{lang}}"
+        # Custom Language Mappings Below
+        # Japanese Vertical Mapping
+        mappings = [
+          {
+            matches = "jpn_vert"
+            args = [ "-l", "jpn_vert", "--pdf-renderer", "sandwich", "--tesseract-pagesegmode", "5" ]
+          },
+        # Start Other Custom Language Mappings Here
+        # Default Mapping Below
+          {
+            matches = ".*"
+            args = [ "-l", "{{lang}}" ]
+          }
+        ]
+      }
+    }
       enabled = true
       command = {
         program = "ocrmypdf"
+        # Default arguments for all processing go below.
         args = [
-          "-l", "{{lang}}",
+          "{{ocr_lang}}",
           "--skip-text",
           "--deskew",
           "-j", "1",
@@ -893,4 +933,4 @@ Docpell Update Check
       }
     }
   }
-}
+}