-#define ALPHA_TEXT N_("Alpha blending")
-#define ALPHA_LONGTEXT N_("Alpha blending (0 -> 255). Default is 255")
-
-#define HEIGHT_TEXT N_("Height in pixels")
-#define WIDTH_TEXT N_("Width in pixels")
-#define XOFFSET_TEXT N_("Top left corner x coordinate")
-#define YOFFSET_TEXT N_("Top left corner y coordinate")
-#define VBORDER_TEXT N_("Vertical border width in pixels")
-#define HBORDER_TEXT N_("Horizontal border width in pixels")
-#define ALIGN_TEXT N_("Mosaic alignment")
+#define ALPHA_TEXT N_("Transparency")
+#define ALPHA_LONGTEXT N_("Transparency of the mosaic foreground pictures. " \
+ "0 means transparent, 255 opaque (default)." )
+
+#define HEIGHT_TEXT N_("Height")
+#define HEIGHT_LONGTEXT N_( "Total height of the mosaic, in pixels." )
+#define WIDTH_TEXT N_("Width")
+#define WIDTH_LONGTEXT N_( "Total width of the mosaic, in pixels." )
+
+#define XOFFSET_TEXT N_("Top left corner X coordinate")
+#define XOFFSET_LONGTEXT N_("X Coordinate of the top-left corner of the mosaic.")
+#define YOFFSET_TEXT N_("Top left corner Y coordinate")
+#define YOFFSET_LONGTEXT N_("Y Coordinate of the top-left corner of the mosaic.")
+#define VBORDER_TEXT N_("Vertical border width")
+#define VBORDER_LONGTEXT N_( "With in pixels of the border than can be drawn " \
+ "vertically around the mosaic" )
+#define HBORDER_TEXT N_("Horizontal border width")
+#define HBORDER_LONGTEXT N_( "With in pixels of the border than can be drawn " \
+ "horizontally around the mosaic" )
+
+#define ALIGN_TEXT N_("Mosaic alignment" )
+#define ALIGN_LONGTEXT N_( \
+ "You can enforce the mosaic alignment on the video " \
+ "(0=center, 1=left, 2=right, 4=top, 8=bottom, you can " \
+ "also use combinations of these values, eg 6 = top-right).")