Add message contexts to distinguish "Pitch" meanings
The word "Pitch" appears in two places with different meanings:
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src/input/es_out.c: line 3254, EsOutUpdateInfo(), where "Pitch" is in view point context, in the same set as "Yaw" and "Roll", and
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modules/video_output/vmem.c: line 48, T_PITCH macro, where "Pitch" means framebuffer pitch.
This makes it impossible to translate the two meanings simultaneously, unless message contexts are added to separate them into different msgid's.