Translations: update all other languages

The following messages will be entirely or partly in English until updated.

```
#: constraint.cpp:151
msgid ""
"The point you selected does not belong to the arc. The arc and line segment "
"do not share an end point.\n"
"\n"
"Select the end point of the arc at which you want it to be tangent to the "
"line."

#: constraint.cpp:158
msgid ""
"The tangent arc and line segment must share an endpoint. Constrain them with "
"Constrain -> On Point before constraining tangent.\n"
"\n"
"Alternatively select the end point of the arc at which you want it to be "
"tangent to the line."

#: constraint.cpp:186
msgid ""
"The point you selected is not an end point of the cubic spline. The spline "
"and line segment do not share an end point.\n"
"\n"
"Select the end point of the spline at which you want it to be tangent to the "

#: constraint.cpp:193
msgid ""
"The tangent cubic spline and line segment must share an endpoint. Constrain "
"them with Constrain -> On Point before constraining tangent.\n"
"\n"
"Alternatively select the end point of the cubic spline at which you want it "
"to be tangent to the line."

#: constraint.cpp:237
msgid ""
"The points you selected are not end points of the two curves. The curves do "
"not share an end point.\n"
"\n"
"Select the end points of both curves at which you want them to be tangent to "
"each other."

#: constraint.cpp:244
msgid ""
"The curves must share an endpoint. Constrain them with Constrain -> On Point "
"before constraining tangent.\n"
"\n"
"Alternatively select the end points of both curves at which you want the "
"curves to be tangent."

#: constraint.cpp:887
msgid ""
"Bad selection for parallel / tangent constraint. This constraint can apply "
"to:\n"
"\n"
"    * two faces\n"
"    * two or more line segments (parallel)\n"
"    * one or more line segments and one or more normals (parallel)\n"
"    * two or more normals (parallel)\n"
"    * two line segments, arcs, or beziers, that share an endpoint (tangent)\n"
"    * two line segments, arcs, or beziers, that do not share an endpoint and "
"the end point(s) of the curve(s) (tangent)\n"
```

Author: ruevs