diff --git a/lib/RELEASE-NOTES b/lib/RELEASE-NOTES
index 9d52b53c48..7fee69a461 100644
--- a/lib/RELEASE-NOTES
+++ b/lib/RELEASE-NOTES
@@ -51,6 +51,10 @@
 
 * info-insert buffer vcs-*: renamed to info-insert vcs *
 
+* file-insert: optional second parameter "ignorelang" to make the insertion
+  ignore the inserted file's main language (and rather adapt it to the insertion
+  context's language).
+
 
 !!!The following LyX functions have been removed in 2.4:
 
diff --git a/src/BufferView.cpp b/src/BufferView.cpp
index 900207c238..ba8c768ca4 100644
--- a/src/BufferView.cpp
+++ b/src/BufferView.cpp
@@ -2875,7 +2875,7 @@ void BufferView::updatePosCache()
 }
 
 
-void BufferView::insertLyXFile(FileName const & fname)
+void BufferView::insertLyXFile(FileName const & fname, bool const ignorelang)
 {
 	LASSERT(d->cursor_.inTexted(), return);
 
@@ -2893,8 +2893,12 @@ void BufferView::insertLyXFile(FileName const & fname)
 		ErrorList & el = buffer_.errorList("Parse");
 		// Copy the inserted document error list into the current buffer one.
 		el = buf.errorList("Parse");
+		ParagraphList & pars = buf.paragraphs();
+		if (ignorelang)
+			// set main language of imported file to context language
+			buf.changeLanguage(buf.language(), d->cursor_.getFont().language());
 		buffer_.undo().recordUndo(d->cursor_);
-		cap::pasteParagraphList(d->cursor_, buf.paragraphs(),
+		cap::pasteParagraphList(d->cursor_, pars,
 					     buf.params().documentClassPtr(), el);
 		res = _("Document %1$s inserted.");
 	} else {
diff --git a/src/BufferView.h b/src/BufferView.h
index 5bad57ca0e..520ecdb0d5 100644
--- a/src/BufferView.h
+++ b/src/BufferView.h
@@ -340,7 +340,7 @@ public:
 	// Insert plain text file (if filename is empty, prompt for one)
 	void insertPlaintextFile(support::FileName const & f, bool asParagraph);
 	///
-	void insertLyXFile(support::FileName const & f);
+	void insertLyXFile(support::FileName const & f, bool const ignorelang = false);
 	/// save temporary bookmark for jump back navigation
 	void bookmarkEditPosition();
 	/// Find and return the inset associated with given dialog name.
diff --git a/src/LyXAction.cpp b/src/LyXAction.cpp
index 92734a202a..969ef64be0 100644
--- a/src/LyXAction.cpp
+++ b/src/LyXAction.cpp
@@ -1571,8 +1571,10 @@ void LyXAction::init()
 /*!
  * \var lyx::FuncCode lyx::LFUN_FILE_INSERT
  * \li Action: Inserts another LyX file.
- * \li Syntax: file-insert [<FILE>]
+ * \li Syntax: file-insert [<FILE>] [ignorelang]
  * \li Params: <FILE>: Filename to be inserted.
+ *             ignorelang: If given, the (main) language of the inserted file
+ *             is ignored (the context language is used).
  * \endvar
  */
 		{ LFUN_FILE_INSERT, "file-insert", Noop, Edit },
diff --git a/src/frontends/qt4/GuiView.cpp b/src/frontends/qt4/GuiView.cpp
index dfab5d7230..98dba1dfa5 100644
--- a/src/frontends/qt4/GuiView.cpp
+++ b/src/frontends/qt4/GuiView.cpp
@@ -2605,7 +2605,7 @@ void GuiView::newDocument(string const & filename, string templatefile,
 }
 
 
-void GuiView::insertLyXFile(docstring const & fname)
+void GuiView::insertLyXFile(docstring const & fname, bool ignorelang)
 {
 	BufferView * bv = documentBufferView();
 	if (!bv)
@@ -2644,7 +2644,7 @@ void GuiView::insertLyXFile(docstring const & fname)
 		}
 	}
 
-	bv->insertLyXFile(filename);
+	bv->insertLyXFile(filename, ignorelang);
 	bv->buffer().errors("Parse");
 }
 
@@ -4049,9 +4049,13 @@ void GuiView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 				menu->exec(QCursor::pos());
 			break;
 
-		case LFUN_FILE_INSERT:
-			insertLyXFile(cmd.argument());
+		case LFUN_FILE_INSERT: {
+			if (cmd.getArg(1) == "ignorelang")
+				insertLyXFile(from_utf8(cmd.getArg(0)), true);
+			else
+				insertLyXFile(cmd.argument());
 			break;
+		}
 
 		case LFUN_FILE_INSERT_PLAINTEXT:
 		case LFUN_FILE_INSERT_PLAINTEXT_PARA: {
diff --git a/src/frontends/qt4/GuiView.h b/src/frontends/qt4/GuiView.h
index 493b070b25..fa36f7ff8b 100644
--- a/src/frontends/qt4/GuiView.h
+++ b/src/frontends/qt4/GuiView.h
@@ -373,7 +373,7 @@ private:
 	///
 	void toggleFullScreen();
 	///
-	void insertLyXFile(docstring const & fname);
+	void insertLyXFile(docstring const & fname, bool ignorelang = false);
 	///
 	/// Open Export As ... dialog. \p iformat is the format the
 	/// filter is initially set to.