Improvements for some English strings

[zarl]

Running through the current de.po file I noticed some strings that may need some improvement and/or correction:

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Save changes to the panorama before closing?

-> Save changes to the project (file) before closing?

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in Preferences -> Filenames

The line
 %directory - folder name (based on first image file)\n

should IMHO get an improved description like this:
 %directory - folder name (based on location of first image file)\n

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Save changes to the panorama before opening an other project?
If you load an other project without saving, your changes since your last save will be discarded.

-> instead of "panorama" we should use "project file" instead
-> "another" instead of "an other"
-> you without 'r' in "since you last saved the file"

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One "Tip of the Day" should get some addition

Current string:
Rotating the camera around the entrance pupil (sometimes also called "nodal point") avoids parallax errors and makes panorama creation a lot easier.

my proposal:
Rotating the camera around the entrance pupil of the lens (sometimes incorrectly called "nodal point") avoids parallax errors and makes panorama creation a lot easier. The Panotools wiki <http://wiki.panotools.org/NPP> helps you to find the correct point for your lens.

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There is a typo (BE instead of AE) somewhere in the .po file:

colour
-> color

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Another typo (plural needed in this case):

Only use control points between image selected in preview window.
-> images

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And where is the string "Feature descriptor:" used? I suspect the german translation is wrong or inaccurate but cannot identify where it is shown in the GUI.

[tmodes (tmodes)]

I will fix the English string. But I will commit the changes after the release of 2017.0. Otherwise there can be conflicts with translations in 2017.0 branch (some translators update the po file on their own and this would create the conflicts.)

Concerning "Feature descriptor": This is used in Preferences -> CP detector -> Edit (Feature descriptor should be translated in connection with Feature matcher below)

[tmodes (tmodes)]

I fixed most of the strings.
But not on all I agree, this remain.