[pt] Add English contraction rule

 - the English ignore logic balks at stuff like "whats", which the
   English tagger fails to tag, and therefore doesn't get recognised
   as English;

 - in order to *kind of* address it, or at least help users and maybe
   convince them to stop adding "whats" to their personal dictionaries,
   we're adding this rule here, with relevant suggestions;

 - global English spellchecking still requires a lot of thinking, but
   this rule here should be safe.

languagetool-language-modules/pt/src/main/java/org/languagetool/language/Portuguese.java

@@ -153,7 +153,8 @@ public List<Rule> getRelevantRules(ResourceBundle messages, UserConfig userConfi
             new PortugueseUnitConversionRule(messages),
             new PortugueseReadabilityRule(messages, this, userConfig, true),
             new PortugueseReadabilityRule(messages, this, userConfig, false),
-            new DoublePunctuationRule(messages)
+            new DoublePunctuationRule(messages),
+            new EnglishContractionSpellingRule(messages, this)
     );
   }
 
@@ -255,6 +256,7 @@ public boolean isAdvancedTypographyEnabled() {
     id2prio.put("AUX_VERBO", -45);
     id2prio.put("ENSINO_A_DISTANCIA", -45);
     id2prio.put("OQ_O_QUE_ORTHOGRAPHY", -45);
+    id2prio.put("PT_ENGLISH_CONTRACTION_ORTHOGRAPHY", -45);
     id2prio.put("EMAIL_SEM_HIFEN", -45); // HIGHER THAN SPELLER
     // MORFOLOGIK SPELLER FITS HERE AT -50 ---------------------  // SPELLER (-50)
     id2prio.put("PRETERITO_PERFEITO", -51);  // LOWER THAN SPELLER

languagetool-language-modules/pt/src/main/java/org/languagetool/rules/pt/EnglishContractionSpellingRule.java

@@ -0,0 +1,91 @@
+/* LanguageTool, a natural language style checker
+ * Copyright (C) 2005 Daniel Naber (http://www.danielnaber.de)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
+ * USA
+ */
+package org.languagetool.rules.pt;
+
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.ResourceBundle;
+
+import org.languagetool.Language;
+import org.languagetool.rules.*;
+
+/**
+ * A rule that matches words or phrases which should not be used and suggests
+ * correct ones instead, e.g. {@code Hasnt} instead of {@code Hasn't}.
+ * This was copied to Portuguese from English to help users with code-switching and improve
+ * tagging tokens with _english_ignore_.
+ *
+ * @author Marcin Miłkowski
+ * @since 2.5
+ */
+public class EnglishContractionSpellingRule extends AbstractSimpleReplaceRule {
+
+  public static final String ENGLISH_CONTRACTION_SPELLING_RULE = "PT_ENGLISH_CONTRACTION_ORTHOGRAPHY";
+
+  private static final Map<String, List<String>> wrongWords = loadFromPath("/pt/english_contractions.txt");
+  private static final Locale PT_LOCALE = new Locale("pt");
+
+  @Override
+  public Map<String, List<String>> getWrongWords() {
+    return wrongWords;
+  }
+
+  public EnglishContractionSpellingRule(ResourceBundle messages, Language language) {
+    super(messages, language);
+    super.setCategory(Categories.TYPOS.getCategory(messages));
+    setLocQualityIssueType(ITSIssueType.Misspelling);
+    addExamplePair(Example.wrong("Ele adorava assistir <marker>whats</marker> cooking às sextas-feiras."),
+      Example.fixed("Ele adorava assistir <marker>what's</marker> cooking às sextas-feiras."));
+//    setUrl(Tools.getUrl("https://languagetool.org/insights/post/grammar-contractions/"));
+    super.setCheckLemmas(false);
+  }
+
+  @Override
+  public final String getId() {
+    return ENGLISH_CONTRACTION_SPELLING_RULE;
+  }
+
+  @Override
+  public String getDescription() {
+    return "Ortografia de contrações inglesas";
+  }
+
+  @Override
+  public String getShort() {
+    return "Erro de ortografia inglesa";
+  }
+
+  @Override
+  public String getMessage(String tokenStr, List<String> replacements) {
+    return "Caso seja uma contração da língua inglesa, prefira \"" + replacements.get(0) + "\".";
+  }
+
+  @Override
+  public boolean isCaseSensitive() {
+    return true;
+  }
+
+  @Override
+  public Locale getLocale() {
+    return PT_LOCALE;
+  }
+
+}
+

languagetool-language-modules/pt/src/main/resources/org/languagetool/rules/pt/english_contractions.txt

@@ -0,0 +1,198 @@
+#Common English contractions
+#Used because our speller dictionaries
+#do not include forms with the apostrophe 
+#The file is case sensitive to avoid false alarms for "Ill" and "Im"
+#(c) 2013 Marcin Milkowski
+#Licensed under LGPL
+aint=ain't
+ainT=ain't
+Aint=Ain't
+AINT=AIN'T
+arent=aren't
+arenT=aren't
+Arent=Aren't
+ARENT=AREN'T
+#cant=can't
+couldnt=couldn't
+couldnT=couldn't
+Couldnt=Couldn't
+COULDNT=COULDN'T
+didnt=didn't
+didnT=didn't
+Didnt=Didn't
+doesnt=doesn't
+doesnT=doesn't
+Doesnt=Doesn't
+DOESNT=DOESN'T
+dont=don't
+donT=don't
+Dont=Don't
+DONT=DON'T
+hadnt=hadn't
+hadnT=hadn't
+Hadnt=Hadn't
+HADNT=HADN'T
+hasnt=hasn't
+hasnT=hasn't
+Hasnt=Hasn't
+havent=haven't
+havenT=haven't
+Havent=Haven't
+HAVENT=HAVEN'T
+hed=he'd
+Hed=He'd
+#hell=he'll #too ambiguous
+hes=he's
+heS=he's
+Hes=He's
+howd=how'd
+Howd=How'd
+hows=how's
+Hows=How's
+howll=how'll
+Howll=How'll
+Id=I'd|ID
+Im=I'm
+#Ive=I've
+isnt=isn't
+isnT=isn't
+Isnt=Isn't
+ISNT=ISN'T
+#its=it's
+#lets=let's
+mightnt=mightn't
+Mightnt=Mightn't
+MIGHTNT=MIGHTN'T
+mustve=must've
+Mustve=Must've
+MUSTVE=MUST'VE
+mustnt=mustn't
+Mustnt=Mustn't
+MUSTNT=MUSTN'T
+neednt=needn't
+Neednt=Needn't
+NEEDNT=NEEDN'T
+oclock=o'clock
+Oclock=O'clock
+OCLOCK=O'CLOCK
+shant=shan't
+Shant=Shan't
+SHANT=SHAN'T
+#shed=she'd
+#shell=she'll
+shes=she's
+sheS=she's
+Shes=She's
+SHES=SHE'S
+shouldve=should've
+Shouldve=Should've
+SHOULDVE=SHOULD'VE
+shouldnt=shouldn't
+shouldnT=shouldn't
+Shouldnt=Shouldn't
+SHOULDNT=SHOULDN'T
+thatd=that'd
+Thatd=That'd
+THATD=THAT'D
+thats=that's
+Thats=That's
+THATS=THAT'S
+thered=there'd
+Thered=There'd
+THERED=THERE'D
+theres=there's
+Theres=There's
+THERES=THERE'S
+therere=there are
+THERERE=THERE ARE
+Therere=There are
+theyd=they'd
+Theyd=They'd
+THEYD=THEY'D
+theyll=they'll
+Theyll=They'll
+THEYLL=THEY'LL
+theyre=they're
+Theyre=They're
+THEYRE=THEY'RE
+theyve=they've
+Theyve=They've
+THEYVE=THEY'VE
+wasnt=wasn't
+wasnT=wasn't
+WASNT=WASN'T
+Wasnt=Wasn't
+#wed=we'd -- false alarms, needs a proper rule
+#not Wed: short for Wednesday
+#were=we're
+#well=we'll
+weve=we've
+Weve=We've
+WEVE=WE'VE
+werent=weren't
+werenT=weren't
+Werent=Weren't
+WERENT=WEREN'T
+whatll=what'll
+Whatll=What'll
+WHATLL=WHAT'LL
+whatre=what're
+Whatre=What're
+WHATRE=WHAT'RE
+whats=what's
+Whats=What's
+WHATS=WHAT'S
+whatd=what'd
+Whatd=What'd
+WHATD=WHAT'D
+whatve=what've
+Whatve=What've
+WHATVE=WHAT'VE
+whens=when's
+Whens=When's
+WHENS=WHEN'S
+wheres=where's
+Wheres=Where's
+WHERES=WHERE'S
+whereve=where've|wherever
+Whereve=Where've|Wherever
+WHEREVE=WHERE'VE|WHEREVER
+whod=who'd
+Whod=Who'd
+WHOD=WHO'D
+wholl=who'll
+Wholl=Who'll
+WHOLL=WHO'LL
+#whore=who're
+whos=who's
+Whos=Who's
+WHOS=WHO'S
+whove=who've
+Whove=Who've
+WHOVE=WHO'VE
+whys=why's
+Whys=Why's
+WHYS=WHY'S
+#wont=won't
+wouldve=would've
+Wouldve=Would've
+WOULDVE=WOULD'VE
+wouldnt=wouldn't
+wouldnT=wouldn't
+Wouldnt=Wouldn't
+WOULDNT=WOULDN'T
+yall=y'all
+Yall=Y'all
+YALL=Y'ALL
+youd=you'd
+Youd=You'd
+YOUD=YOU'D
+youll=you'll
+Youll=You'll
+YOULL=YOU'LL
+youre=you're
+Youre=You're
+YOURE=YOU'RE
+youve=you've
+Youve=You've
+YOUVE=YOU'VE