diff --git a/app/src/main/java/org/fdroid/fdroid/Preferences.java b/app/src/main/java/org/fdroid/fdroid/Preferences.java
index c436694a2..d9243712a 100644
--- a/app/src/main/java/org/fdroid/fdroid/Preferences.java
+++ b/app/src/main/java/org/fdroid/fdroid/Preferences.java
@@ -40,7 +40,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
         if (preferences.getString(PREF_LOCAL_REPO_NAME, null) == null) {
             preferences.edit()
                     .putString(PREF_LOCAL_REPO_NAME, getDefaultLocalRepoName())
-                    .commit();
+                    .apply();
         }
     }
 
@@ -113,7 +113,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
     }
 
     public void setPrivilegedInstallerEnabled(boolean enable) {
-        preferences.edit().putBoolean(PREF_PRIVILEGED_INSTALLER, enable).commit();
+        preferences.edit().putBoolean(PREF_PRIVILEGED_INSTALLER, enable).apply();
     }
 
     public boolean isFirstTime() {
@@ -121,7 +121,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
     }
 
     public void setFirstTime(boolean firstTime) {
-        preferences.edit().putBoolean(PREF_FIRST_TIME, firstTime).commit();
+        preferences.edit().putBoolean(PREF_FIRST_TIME, firstTime).apply();
     }
 
     public boolean isPostPrivilegedInstall() {
@@ -129,7 +129,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
     }
 
     public void setPostPrivilegedInstall(boolean postInstall) {
-        preferences.edit().putBoolean(PREF_POST_PRIVILEGED_INSTALL, postInstall).commit();
+        preferences.edit().putBoolean(PREF_POST_PRIVILEGED_INSTALL, postInstall).apply();
     }
 
     public boolean shouldCacheApks() {
@@ -149,7 +149,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
     }
 
     public void setShowNfcDuringSwap(boolean show) {
-        preferences.edit().putBoolean(PREF_SHOW_NFC_DURING_SWAP, show).commit();
+        preferences.edit().putBoolean(PREF_SHOW_NFC_DURING_SWAP, show).apply();
     }
 
     public boolean expertMode() {
diff --git a/app/src/main/java/org/fdroid/fdroid/UpdateService.java b/app/src/main/java/org/fdroid/fdroid/UpdateService.java
index 927d4783d..407a27078 100644
--- a/app/src/main/java/org/fdroid/fdroid/UpdateService.java
+++ b/app/src/main/java/org/fdroid/fdroid/UpdateService.java
@@ -406,7 +406,7 @@ public class UpdateService extends IntentService implements ProgressListener {
 
             SharedPreferences.Editor e = prefs.edit();
             e.putLong(Preferences.PREF_UPD_LAST, System.currentTimeMillis());
-            e.commit();
+            e.apply();
 
             if (errorRepos == 0) {
                 if (changes) {
diff --git a/app/src/main/java/org/fdroid/fdroid/compat/FileCompat.java b/app/src/main/java/org/fdroid/fdroid/compat/FileCompat.java
index aae28192c..4f0031ac7 100644
--- a/app/src/main/java/org/fdroid/fdroid/compat/FileCompat.java
+++ b/app/src/main/java/org/fdroid/fdroid/compat/FileCompat.java
@@ -11,6 +11,12 @@ import org.fdroid.fdroid.data.SanitizedFile;
 import java.io.IOException;
 import java.lang.reflect.Method;
 
+/**
+ * This class works only with {@link SanitizedFile} instances to enforce
+ * filtering of the file names from files downloaded from the internet.
+ * This helps prevent things like SQL injection, shell command injection
+ * and other attacks based on putting various characters into filenames.
+ */
 public class FileCompat extends Compatibility {
 
     private static final String TAG = "FileCompat";
diff --git a/app/src/main/java/org/fdroid/fdroid/net/Downloader.java b/app/src/main/java/org/fdroid/fdroid/net/Downloader.java
index e66b793ad..180d3aebd 100644
--- a/app/src/main/java/org/fdroid/fdroid/net/Downloader.java
+++ b/app/src/main/java/org/fdroid/fdroid/net/Downloader.java
@@ -40,7 +40,7 @@ public abstract class Downloader {
 
     protected abstract InputStream getDownloadersInputStream() throws IOException;
 
-    protected abstract void close() throws IOException;
+    protected abstract void close();
 
     Downloader(URL url, File destFile)
             throws FileNotFoundException, MalformedURLException {
@@ -117,11 +117,6 @@ public abstract class Downloader {
     }
 
     /**
-     * In a synchronous download (the usual usage of the Downloader interface),
-     * you will not be able to interrupt this because the thread will block
-     * after you have called download(). However if you use the AsyncDownloadWrapper,
-     * then it will use this mechanism to cancel the download.
-     *
      * After every network operation that could take a while, we will check if an
      * interrupt occured during that blocking operation. The goal is to ensure we
      * don't move onto another slow, network operation if we have cancelled the
diff --git a/app/src/main/java/org/fdroid/fdroid/net/LocalFileDownloader.java b/app/src/main/java/org/fdroid/fdroid/net/LocalFileDownloader.java
index ecd23ae86..7e249040e 100644
--- a/app/src/main/java/org/fdroid/fdroid/net/LocalFileDownloader.java
+++ b/app/src/main/java/org/fdroid/fdroid/net/LocalFileDownloader.java
@@ -1,5 +1,7 @@
 package org.fdroid.fdroid.net;
 
+import org.fdroid.fdroid.Utils;
+
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
@@ -10,22 +12,23 @@ import java.net.URL;
 
 public class LocalFileDownloader extends Downloader {
 
+    private InputStream inputStream;
+
     LocalFileDownloader(URL url, File destFile) throws FileNotFoundException, MalformedURLException {
         super(url, destFile);
     }
 
-    private File getFileToDownload() {
-        return new File(sourceUrl.getPath());
-    }
-
     @Override
     protected InputStream getDownloadersInputStream() throws IOException {
-        return new FileInputStream(getFileToDownload());
+        inputStream = new FileInputStream(new File(sourceUrl.getPath()));
+        return inputStream;
     }
 
     @Override
-    protected void close() throws IOException {
-        // Do nothing.
+    protected void close() {
+        if (inputStream != null) {
+            Utils.closeQuietly(inputStream);
+        }
     }
 
     @Override
diff --git a/app/src/main/java/org/fdroid/fdroid/views/fragments/AppListFragment.java b/app/src/main/java/org/fdroid/fdroid/views/fragments/AppListFragment.java
index 35918f065..5f326cc4f 100644
--- a/app/src/main/java/org/fdroid/fdroid/views/fragments/AppListFragment.java
+++ b/app/src/main/java/org/fdroid/fdroid/views/fragments/AppListFragment.java
@@ -141,7 +141,7 @@ public abstract class AppListFragment extends ListFragment implements
         boolean hasTriedEmptyUpdate = prefs.getBoolean(triedEmptyUpdate, false);
         if (!hasTriedEmptyUpdate) {
             Utils.debugLog(TAG, "Empty app list, and we haven't done an update yet. Forcing repo update.");
-            prefs.edit().putBoolean(triedEmptyUpdate, true).commit();
+            prefs.edit().putBoolean(triedEmptyUpdate, true).apply();
             UpdateService.updateNow(getActivity());
             return true;
         }
diff --git a/app/src/main/java/org/fdroid/fdroid/views/fragments/AvailableAppsFragment.java b/app/src/main/java/org/fdroid/fdroid/views/fragments/AvailableAppsFragment.java
index 24f87f224..f75b6eafd 100644
--- a/app/src/main/java/org/fdroid/fdroid/views/fragments/AvailableAppsFragment.java
+++ b/app/src/main/java/org/fdroid/fdroid/views/fragments/AvailableAppsFragment.java
@@ -230,7 +230,7 @@ public class AvailableAppsFragment extends AppListFragment implements
                 Context.MODE_PRIVATE);
         SharedPreferences.Editor e = p.edit();
         e.putString(CATEGORY_KEY, currentCategory);
-        e.commit();
+        e.apply();
     }
 
     @Override
diff --git a/app/src/main/java/org/fdroid/fdroid/views/fragments/PreferencesFragment.java b/app/src/main/java/org/fdroid/fdroid/views/fragments/PreferencesFragment.java
index c6007348e..f8a40f920 100644
--- a/app/src/main/java/org/fdroid/fdroid/views/fragments/PreferencesFragment.java
+++ b/app/src/main/java/org/fdroid/fdroid/views/fragments/PreferencesFragment.java
@@ -204,13 +204,13 @@ public class PreferencesFragment extends PreferenceFragment
                         // privileged permission are granted, i.e. the extension is installed correctly
                         SharedPreferences.Editor editor = pref.getSharedPreferences().edit();
                         editor.putBoolean(Preferences.PREF_PRIVILEGED_INSTALLER, true);
-                        editor.commit();
+                        editor.apply();
                         pref.setChecked(true);
                     } else {
                         // privileged permission not available
                         SharedPreferences.Editor editor = pref.getSharedPreferences().edit();
                         editor.putBoolean(Preferences.PREF_PRIVILEGED_INSTALLER, false);
-                        editor.commit();
+                        editor.apply();
                         pref.setChecked(false);
 
                         AlertDialog.Builder alertBuilder = new AlertDialog.Builder(getActivity());
@@ -248,7 +248,7 @@ public class PreferencesFragment extends PreferenceFragment
                 } else {
                     SharedPreferences.Editor editor = pref.getSharedPreferences().edit();
                     editor.putBoolean(Preferences.PREF_PRIVILEGED_INSTALLER, false);
-                    editor.commit();
+                    editor.apply();
                     pref.setChecked(false);
                 }
 
diff --git a/app/src/main/res/values-fi/strings.xml b/app/src/main/res/values-fi/strings.xml
index 17e93b7f2..2cc397980 100644
--- a/app/src/main/res/values-fi/strings.xml
+++ b/app/src/main/res/values-fi/strings.xml
@@ -108,7 +108,7 @@
   <string name="proxy_port_summary">Määritä välityspalvelimesi porttinumero (esim. 8118)</string>
   <string name="repos_unchanged">Yhdessäkään säilössä ei ole pakettipäivityksiä</string>
   <string name="all_other_repos_fine">Muut säilöt eivät luoneet virheitä.</string>
-  <string name="global_error_updating_repos">Päivityksenaikainen virhe:</string>
+  <string name="global_error_updating_repos">Päivityksenaikainen virhe: %s</string>
   <string name="theme">Teema</string>
   <string name="unverified">Vahvistamaton</string>
   <string name="repo_not_yet_updated">Tätä säilöä ei ole vielä käytetty.
diff --git a/app/src/main/res/values-lt/strings.xml b/app/src/main/res/values-lt/strings.xml
index 4c1c23cfb..f97fb6a54 100644
--- a/app/src/main/res/values-lt/strings.xml
+++ b/app/src/main/res/values-lt/strings.xml
@@ -63,7 +63,7 @@
   <string name="status_connecting_to_repo">Jungiamasi prie
 %1$s</string>
   <string name="repos_unchanged">Įjungtose saugyklose nėra nieko naujo</string>
-  <string name="global_error_updating_repos">Klaida naujinant:</string>
+  <string name="global_error_updating_repos">Klaida naujinant: %s</string>
   <string name="theme">Tema</string>
   <string name="repo_num_apps">Programų kiekis</string>
   <string name="repo_description">Aprašymas</string>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 0a0f0df40..945cfaacb 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -184,7 +184,7 @@
 
     <string name="local_repo_running">F-Droid已准备好交换应用</string>
     <string name="touch_to_configure_local_repo">触摸可查看详细信息以及允许其他人与你交换应用程序。</string>
-    <string name="adding_apks_format">正在添加 ％s 到软件源…</string>
+    <string name="adding_apks_format">正在添加 %s 到软件源…</string>
     <string name="writing_index_jar">正在写入已签名的索引文件（index.jar）…</string>
     <string name="failed_to_create_index">创建软件源索引失败！</string>
     <string name="linking_apks">正在链接APK到软件源……</string>