[de] make entries in prohibit.txt work when followed by dot

languagetool-language-modules/de/src/main/java/org/languagetool/rules/de/GermanSpellerRule.java

@@ -2286,16 +2286,17 @@ && isMisspelled(word)
 
   @Override
   protected boolean ignorePotentiallyMisspelledWord(String word) throws IOException {
-    if (isValidWordLength(word) || startsWithLowercase(word) || isProhibited(word)) {
+    // Remove dot
+    String wordNoDot = word.endsWith(".") ? word.substring(0, word.length()-1) : word;
+
+    if (isValidWordLength(word) || startsWithLowercase(word) || isProhibited(word) || isProhibited(wordNoDot)) {
       // Exclude cases like weird/irrelevant words and very long words that can cause crashes
       return false;
     }
     // Check for words that are likely to be typos
     if (isProbablyTypo(word)) {
       return false;
     }
-    // Remove dot
-    String wordNoDot = word.endsWith(".") ? word.substring(0, word.length()-1) : word;
 
     // Format gender neutral forms here to make splitting easier, but
     //   we need to double-check the word later to avoid words in camel case

languagetool-language-modules/de/src/test/java/org/languagetool/rules/spelling/hunspell/SpellingCheckRuleTest.java

@@ -77,4 +77,10 @@ public void testMultitokenSpelling() throws IOException {
     assertThat(lt.check("Groß Oessingen").size(), is(1));
     assertThat(lt.check("Eching am Ammerse").size(), is(2));
   }
+
+  @Test
+  public void testProhibitedWordFollowedByDot() throws IOException {
+    JLanguageTool lt = new JLanguageTool(Languages.getLanguageForShortCode("de-DE"));
+    assertThat(lt.check("Bestanteil.").size(), is(1));
+  }
 }