diff --git a/app/src/main/res/values-ksh/strings.xml b/app/src/main/res/values-ksh/strings.xml
deleted file mode 100644
index 2b5d41167..000000000
--- a/app/src/main/res/values-ksh/strings.xml
+++ /dev/null
@@ -1 +0,0 @@
-<?xml version="1.0"?>
diff --git a/app/src/main/res/values-x-invalidLanguageCode/error.xml b/app/src/main/res/values-x-invalidLanguageCode/error.xml
deleted file mode 100644
index 049faccbf..000000000
--- a/app/src/main/res/values-x-invalidLanguageCode/error.xml
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-  <string name="crash_dialog_title">共享资源应用已经崩溃</string>
-  <string name="crash_dialog_text">糟糕。出错了！</string>
-  <string name="crash_dialog_comment_prompt">请告诉我们你刚才正在做什么，并通过电子邮件发送给我们。这会帮助我们修复这个错误！</string>
-  <string name="crash_dialog_ok_toast">谢谢！</string>
-</resources>
diff --git a/app/src/main/res/values-x-invalidLanguageCode/strings.xml b/app/src/main/res/values-x-invalidLanguageCode/strings.xml
deleted file mode 100644
index 8ec839678..000000000
--- a/app/src/main/res/values-x-invalidLanguageCode/strings.xml
+++ /dev/null
@@ -1,112 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-  <string name="app_name" fuzzy="true">维基共享资源</string>
-  <string name="menu_settings">设置</string>
-  <string name="username">用户名</string>
-  <string name="password">密码</string>
-  <string name="login">登录</string>
-  <string name="logging_in_title">正在登录</string>
-  <string name="logging_in_message">请稍候...</string>
-  <string name="login_success">登录成功！</string>
-  <string name="login_failed">登录失败！</string>
-  <string name="authentication_failed">身份验证失败！</string>
-  <string name="uploading_started">上传开始！</string>
-  <string name="upload_completed_notification_title">%1$s已上传！</string>
-  <string name="upload_completed_notification_text">点击查看你的上传</string>
-  <string name="upload_progress_notification_title_start">开始%1$s的上传</string>
-  <string name="upload_progress_notification_title_in_progress">%1$s正在上传</string>
-  <string name="upload_progress_notification_title_finishing">完成上传%1$s</string>
-  <string name="upload_failed_notification_title">上传%1$s失败</string>
-  <string name="upload_failed_notification_subtitle">点击查看</string>
-  <string name="title_activity_contributions">我的上传</string>
-  <string name="contribution_state_queued">队列</string>
-  <string name="contribution_state_failed">失败</string>
-  <string name="contribution_state_in_progress">%1$d%%完成</string>
-  <string name="contribution_state_starting">正在上传</string>
-  <string name="menu_from_gallery">来自图库</string>
-  <string name="menu_from_camera">拍照</string>
-  <string name="provider_contributions">我的上传</string>
-  <string name="menu_share">分享</string>
-  <string name="menu_open_in_browser">在浏览器中查看</string>
-  <string name="share_title_hint">标题</string>
-  <string name="share_description_hint">描述</string>
-  <string name="login_failed_network">无法登录 - 网络故障</string>
-  <string name="login_failed_username">无法登录 - 请检查你的用户名</string>
-  <string name="login_failed_password">无法登录 - 请检查你的密码</string>
-  <string name="login_failed_throttled" fuzzy="true">失败次数过多。请在几分钟后重试</string>
-  <string name="login_failed_blocked">对不起，该用户已经被共享资源封禁</string>
-  <string name="login_failed_generic">登录失败</string>
-  <string name="share_upload_button">上传</string>
-  <string name="multiple_share_base_title">命名该组图像</string>
-  <string name="provider_modifications">修改</string>
-  <string name="menu_upload_single">上传</string>
-  <string name="categories_search_text_hint">搜索分类</string>
-  <string name="menu_save_categories">保存</string>
-  <string name="categories_not_found">没有找到匹配%1$s的分类</string>
-  <string name="categories_skip_explanation">添加分类使你的图像更容易在维基共享资源被找到。
-
-开始输入以添加分类。
-点击该信息（或按返回）以跳过此步。</string>
-  <string name="categories_activity_title">分类</string>
-  <string name="preference_tracking">使用报告</string>
-  <string name="preference_tracking_summary">发送使用报告至维基媒体以帮助我们改进该应用</string>
-  <string name="title_activity_settings">设置</string>
-  <string name="menu_about">关于</string>
-  <string name="about_license" fuzzy="true">采用&lt;a href=\"https://github.com/wikimedia/apps-android-commons/blob/master/COPYING\"&gt;Apache License v2&lt;/a&gt;授权的开源软件</string>
-  <string name="about_improve" fuzzy="true">源代码位于&lt;a href=\"https://github.com/wikimedia/apps-android-commons\"&gt;GitHub&lt;/a&gt;。漏洞（bug）报告位于&lt;a href=\"https://bugzilla.wikimedia.org/enter_bug.cgi?product=Commons%20App\"&gt;Bugzilla&lt;/a&gt;。</string>
-  <string name="about_privacy_policy">&lt;a href=\"https://wikimediafoundation.org/wiki/Privacy_policy\"&gt;隐私权政策&lt;/a&gt;</string>
-  <string name="title_activity_about">关于</string>
-  <string name="menu_feedback">发送反馈（通过电子邮件）</string>
-  <string name="provider_categories">最近使用的分类</string>
-  <string name="waiting_first_sync">等待第一次同步...</string>
-  <string name="no_uploads_yet">你还没有上传任何照片。</string>
-  <string name="menu_retry_upload">重试</string>
-  <string name="menu_cancel_upload">取消</string>
-  <string name="share_license_summary">该图像会采用%1$s授权</string>
-  <string name="menu_download">下载</string>
-  <string name="preference_license">许可协议</string>
-  <string name="license_name_cc_by_sa" fuzzy="true">知识共享“署名-相同方式分享u00A03.0”</string>
-  <string name="license_name_cc_by" fuzzy="true">知识共享“署名u00A03.0”</string>
-  <string name="license_name_cc0">CC0</string>
-  <string name="license_name_cc_by_sa_3_0">CC BY-SA 3.0</string>
-  <string name="license_name_cc_by_sa_3_0_at">CC BY-SA 3.0 奥地利</string>
-  <string name="license_name_cc_by_sa_3_0_de">CC BY-SA 3.0 德国</string>
-  <string name="license_name_cc_by_sa_3_0_ee">CC BY-SA 3.0 爱沙尼亚</string>
-  <string name="license_name_cc_by_sa_3_0_es">CC BY-SA 3.0 西班牙</string>
-  <string name="license_name_cc_by_sa_3_0_hr">CC BY-SA 3.0 克罗地亚</string>
-  <string name="license_name_cc_by_sa_3_0_lu">CC BY-SA 3.0 卢森堡</string>
-  <string name="license_name_cc_by_sa_3_0_nl">CC BY-SA 3.0 荷兰</string>
-  <string name="license_name_cc_by_sa_3_0_no">CC BY-SA 3.0 挪威</string>
-  <string name="license_name_cc_by_sa_3_0_pl">CC BY-SA 3.0 波兰</string>
-  <string name="license_name_cc_by_sa_3_0_ro">CC BY-SA 3.0 罗马尼亚</string>
-  <string name="license_name_cc_by_3_0">CC BY 3.0</string>
-  <string name="license_name_cc_zero">CC0</string>
-  <string name="license_name_own_pd">自己的公有领域作品</string>
-  <string name="license_name_cc_by_sa_2_5">CC BY-SA 2.5</string>
-  <string name="license_name_cc_by_2_5">CC BY 2.5</string>
-  <string name="license_name_cc_by_sa_2_0">CC BY-SA 2.0</string>
-  <string name="license_name_cc_by_2_0">CC BY-SA 2.0</string>
-  <string name="license_name_cc_2_0">CC BY 2.0</string>
-  <string name="license_name_fal">自由艺术许可协议</string>
-  <string name="license_name_pd_old_100">公有领域（作者去世于100年前）</string>
-  <string name="license_name_pd_old">公有领域（著作权过期）</string>
-  <string name="license_name_pd_art">公有领域（艺术）</string>
-  <string name="license_name_pd_us">公有领域（美国）</string>
-  <string name="license_name_pd_usgov">公有领域（美国政府）</string>
-  <string name="license_name_pd_usgov_nasa">公有领域（NASA）</string>
-  <string name="license_name_pd_ineligible">公有领域（不受著作权保护）</string>
-  <string name="license_name_attribution">署名</string>
-  <string name="license_name_gfdl">GNU自由文档协议</string>
-  <string name="welcome_wikipedia_text">贡献你的图像。使维基百科的条目更加生动！</string>
-  <string name="welcome_wikipedia_subtext">维基百科上的图像来自维基共享资源。</string>
-  <string name="welcome_copyright_text">您的图像可以帮助教育世界各地的人。</string>
-  <string name="welcome_copyright_subtext">请避免上传你在互联网找到的有版权的素材以及海报的图像、图书封面等。</string>
-  <string name="welcome_final_text">你明白了吗？</string>
-  <string name="welcome_final_button_text">是！</string>
-  <string name="detail_panel_cats_label">分类</string>
-  <string name="detail_panel_cats_loading">正在载入...</string>
-  <string name="detail_panel_cats_none">未选择</string>
-  <string name="detail_description_empty">没有说明</string>
-  <string name="detail_license_empty">未知许可协议</string>
-  <string name="menu_refresh">刷新</string>
-</resources>