Make it an error to use a bare apostrophe in aapt, and adjust warnings/errors.

In practice, no one ever writes an apostrophe in an aapt string with the
intent of using it to quote whitespace -- they always mean to include a
literal apostrophe in the string and then are surprised when they find
the apostrophe missing.  Make this an error so that it is discovered
right away instead of waiting until late in QA or after the strings have
already been sent for translation.  (And fix a recently-introduced string
that has exactly this problem.)

Silence the warning about an empty span in a string, since this seems to
annoy people instead of finding any real problems.

Make the error about having a translated string with no base string into
a warning, since this is a big pain when making changes to an application
that has already had some translations done, and the dead translations
should be removed by a later translation import anyway.
diff --git a/core/res/res/values-en-rUS/donottranslate-names.xml b/core/res/res/values-en-rUS/donottranslate-names.xml
index 42c8ab4..82ba310 100644
--- a/core/res/res/values-en-rUS/donottranslate-names.xml
+++ b/core/res/res/values-en-rUS/donottranslate-names.xml
@@ -147,7 +147,7 @@
         MD, MS, PH.D., PHD, SR, V, VI, VII, VIII, X
     </string>
     <string name="common_last_name_prefixes">
-        D', DE, DEL, DI, LA, LE, MC, SAN, ST, TER, VAN, VON
+        D\', DE, DEL, DI, LA, LE, MC, SAN, ST, TER, VAN, VON
     </string>
     <string name="common_name_conjunctions">
         &amp;, AND, OR
diff --git a/libs/utils/ResourceTypes.cpp b/libs/utils/ResourceTypes.cpp
index 0831f4a..f80843d 100644
--- a/libs/utils/ResourceTypes.cpp
+++ b/libs/utils/ResourceTypes.cpp
@@ -3284,7 +3284,16 @@
                     break;
                 }
                 if (c == '\'' && (quoted == 0 || quoted == '\'')) {
-                    break;
+                    /*
+                     * In practice, when people write ' instead of \'
+                     * in a string, they are doing it by accident
+                     * instead of really meaning to use ' as a quoting
+                     * character.  Warn them so they don't lose it.
+                     */
+                    if (outErrorMsg) {
+                        *outErrorMsg = "Apostrophe not preceded by \\";
+                    }
+                    return false;
                 }
             }
             p++;
diff --git a/tools/aapt/ResourceTable.cpp b/tools/aapt/ResourceTable.cpp
index 95a2384..f9d2434 100644
--- a/tools/aapt/ResourceTable.cpp
+++ b/tools/aapt/ResourceTable.cpp
@@ -2364,13 +2364,12 @@
                         String8 region(config.string(), 2);
                         if (configSet.find(region) == configSet.end()) {
                             if (configSet.count(defaultLocale) == 0) {
-                                fprintf(stdout, "aapt: error: "
+                                fprintf(stdout, "aapt: warning: "
                                         "*** string '%s' has no default or required localization "
                                         "for '%s' in %s\n",
                                         String8(nameIter->first).string(),
                                         config.string(),
                                         mBundle->getResourceSourceDirs()[0]);
-                                err = UNKNOWN_ERROR;
                             }
                         }
                     }
diff --git a/tools/aapt/XMLNode.cpp b/tools/aapt/XMLNode.cpp
index 6daa0d2..d4d2a45c 100644
--- a/tools/aapt/XMLNode.cpp
+++ b/tools/aapt/XMLNode.cpp
@@ -219,7 +219,12 @@
             }
             spanStack.pop();
 
-            if (empty) {
+            /*
+             * This warning seems to be just an irritation to most people,
+             * since it is typically introduced by translators who then never
+             * see the warning.
+             */
+            if (0 && empty) {
                 fprintf(stderr, "%s:%d: warning: empty '%s' span found in text '%s'\n",
                         fileName, inXml->getLineNumber(),
                         String8(spanTag).string(), String8(*outString).string());