Add latex2unicode formatter for displaying previews (#5785)

* Adds call to LatexToUnicodeAdapter.format() to CSLAdapter

Adds extra map to the string data to handle diacritics

* Adds test to check if latex2unicode is working properly

* Update CHANGELOG.md with fix for unicode characters

CHANGELOG.md

@@ -17,6 +17,8 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
 
 - We fixed an issue where the Medline fetcher was only working when JabRef was running from source [#5645](https://github.com/JabRef/jabref/issues/5645)
 - We fixed some visual issues in the dark theme [#5764](https://github.com/JabRef/jabref/pull/5764) [#5753](https://github.com/JabRef/jabref/issues/5753)
+- We fixed an issue where non-default previews didn't handle unicode characters. [#5779](https://github.com/JabRef/jabref/issues/5779)
+
 
 ### Removed
 

src/main/java/org/jabref/logic/citationstyle/CSLAdapter.java

@@ -18,6 +18,7 @@
 import de.undercouch.citeproc.bibtex.BibTeXConverter;
 import de.undercouch.citeproc.csl.CSLItemData;
 import de.undercouch.citeproc.output.Bibliography;
+import org.jabref.model.strings.LatexToUnicodeAdapter;
 import org.jbibtex.BibTeXEntry;
 import org.jbibtex.DigitStringValue;
 import org.jbibtex.Key;
@@ -97,6 +98,7 @@ private static CSLItemData bibEntryToCSLItemData(BibEntry bibEntry) {
             for (Field key : bibEntry.getFieldMap().keySet()) {
                 bibEntry.getField(key)
                         .map(removeNewlinesFormatter::format)
+                        .map(LatexToUnicodeAdapter::format)
                         .map(latexToHtmlConverter::format)
                         .ifPresent(value -> {
                             if (StandardField.MONTH.equals(key)) {

src/test/java/org/jabref/logic/citationstyle/CitationStyleGeneratorTest.java

@@ -117,4 +117,17 @@ void testXslFoFormat() {
         String actualCitation = CitationStyleGenerator.generateCitation(entry, style, format);
         assertEquals(expectedCitation, actualCitation);
     }
+
+    @Test
+    void testHandleDiacritics() {
+        BibEntry entry = new BibEntry();
+        entry.setField(StandardField.AUTHOR, "L{\"a}st, First and Doe, Jane");
+        // if the default citation style changes this has to be modified.
+        // in this case ä was added to check if it is formatted appropriately
+        String expected = "  <div class=\"csl-entry\">\n" +
+                "    <div class=\"csl-left-margin\">[1]</div><div class=\"csl-right-inline\">F. Läst and J. Doe, .</div>\n" +
+                "  </div>\n";
+        String citation = CitationStyleGenerator.generateCitation(entry, CitationStyle.getDefault());
+        assertEquals(expected, citation);
+    }
 }