add converting of tex-style script styles like \em

constants.py

@@ -49,3 +49,7 @@ UTF8_REPLACEMENTS = {
         r'{\ss}': 'ß',
         r'{ß}': 'ß',
 }
+
+TEX_SCRIPTSTYLES = {
+        r'\em' : r'\emph'
+}

latex_legacy_converter.py

@@ -13,6 +13,27 @@ def migrate_old_utf8_escape(line:str):
                 line = line[:m.start()] + new + line[m.end():]
     return line
 
+def migrate_tex_script_styles(line: str):
+    for old, new in TEX_SCRIPTSTYLES.items():
+        while True:
+            old = old.replace('\\', r'\\')
+            m = re.search(r'{' + old + r' *(.*?)}', line)
+            if m is None:
+                break
+            else:
+                line = line[:m.start()] + new + '{' + m.groups()[0] + '}' + line[m.end():]
+    return line
+
+def migrate_old_quotes(line: str):
+    while True:
+        m = re.search(r',,(.*?)``', line)
+        if m is None:
+            break
+        else:
+            line = line[:m.start()] + r'\enquote{' + m.groups()[0] + r'}' + line[m.end():]
+            print(line)
+    return line
+
 
 def _migrate_lazy_math_alphabet(line: str, letters: str, short: str, alph: str):
     for letter in letters:
@@ -71,6 +92,8 @@ def optimize_line(line: str) -> str:
     line = migrate_deprecated(line)
     line = replace_unicode(line)
     line = migrate_old_utf8_escape(line)
+    line = migrate_old_quotes(line)
+    line = migrate_tex_script_styles(line)
     return line